# Mechanics

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motion from point A to point C is split into two parts. The motion from A to B has displacement s1 and takes time t1. The motion from B to C has displacement s2 and takes time t2. a Prove that if t1 = t2 the average speed from A to C is the same as the average of the speeds from A to B and from B to C .

I dont understand this question

I dont understand this question

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#2

(Original post by

motion from point A to point C is split into two parts. The motion from A to B has displacement s1 and takes time t1. The motion from B to C has displacement s2 and takes time t2. a Prove that if t1 = t2 the average speed from A to C is the same as the average of the speeds from A to B and from B to C .

I dont understand this question

**Shas72**)motion from point A to point C is split into two parts. The motion from A to B has displacement s1 and takes time t1. The motion from B to C has displacement s2 and takes time t2. a Prove that if t1 = t2 the average speed from A to C is the same as the average of the speeds from A to B and from B to C .

I dont understand this question

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(Original post by

Have you sketched it? What is it you don't understand?

**mqb2766**)Have you sketched it? What is it you don't understand?

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#4

(Original post by

Iam not able to comprehend the question. Is it talking about speed or velocity

**Shas72**)Iam not able to comprehend the question. Is it talking about speed or velocity

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(Original post by

Have you sketched it? What is it you don't understand?

**mqb2766**)Have you sketched it? What is it you don't understand?

AB= s1/t1, BC=s2/t2

t1=t2=t

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#7

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I don't know what you mean by AB, BC, AC here - it looks like they mean different things between the first line and the second.

**DFranklin**)I don't know what you mean by AB, BC, AC here - it looks like they mean different things between the first line and the second.

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#9

The first thing is to understand what they want you to prove.

* What is the average speed between A and C?

* What is the average of the two (average) speeds A->B and B->C

You have to show they're The same.

The question is about different types of means, but you don't need to know that to complete the question.

* What is the average speed between A and C?

* What is the average of the two (average) speeds A->B and B->C

You have to show they're The same.

The question is about different types of means, but you don't need to know that to complete the question.

Last edited by mqb2766; 1 month ago

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(Original post by

The first thing is to understand what they want you to prove.

* What is the average speed between A and C?

* What is the average of the two (average) speeds A->B and B->C

You have to show they're The same.

The question is about different types of means, but you don't need to know that to complete the question.

**mqb2766**)The first thing is to understand what they want you to prove.

* What is the average speed between A and C?

* What is the average of the two (average) speeds A->B and B->C

You have to show they're The same.

The question is about different types of means, but you don't need to know that to complete the question.

A to B= s1/t1

B to C= s2/t2

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(Original post by

The first thing is to understand what they want you to prove.

* What is the average speed between A and C?

* What is the average of the two (average) speeds A->B and B->C

You have to show they're The same.

The question is about different types of means, but you don't need to know that to complete the

**mqb2766**)The first thing is to understand what they want you to prove.

* What is the average speed between A and C?

* What is the average of the two (average) speeds A->B and B->C

You have to show they're The same.

The question is about different types of means, but you don't need to know that to complete the

(Original post by

Given extra brackets and I'm guessing what the left means, then yes.

**mqb2766**)Given extra brackets and I'm guessing what the left means, then yes.

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(Original post by

Not sure what you're asking.

**mqb2766**)Not sure what you're asking.

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#15

(Original post by

It says if t1=t2

**Shas72**)It says if t1=t2

Tbh, it's easy to complete the proof, you should be able to put the reasoning down based on what you have.

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(Original post by

Not sure what

**mqb2766**)Not sure what

(Original post by

I know that, but you're just writing an expression.

Tbh, it's easy to complete the proof, you should be able to put the reasoning down based on what you have.

**mqb2766**)I know that, but you're just writing an expression.

Tbh, it's easy to complete the proof, you should be able to put the reasoning down based on what you have.

Thanks!

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**mqb2766**)

I know that, but you're just writing an expression.

Tbh, it's easy to complete the proof, you should be able to put the reasoning down based on what you have.

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**mqb2766**)

I know that, but you're just writing an expression.

Tbh, it's easy to complete the proof, you should be able to put the reasoning down based on what you have.

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#19

Rather than just lead you through the answer, why not try and apply what you've "learnt" about average speeds to this question part. Try for 15-30 min first and post what you've tried?

Tbh this part is more interesting (not much harder) as it shows when the arithmetic mean is equal to the harmonic mean. You don't need to know this to do the question though, just use the standard average speed formula.

Tbh this part is more interesting (not much harder) as it shows when the arithmetic mean is equal to the harmonic mean. You don't need to know this to do the question though, just use the standard average speed formula.

Last edited by mqb2766; 1 month ago

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#20

(Original post by

Pls help me with 14(b). I dont understand the question

**Shas72**)Pls help me with 14(b). I dont understand the question

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