# A level physics questions that I need help with

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I don’t understand these questions

a person cycles to a destination with the wind at 8m/s and returns home without stopping, against the wind, at 4m/s

What is the average speed

What is the velocity

And

A ball is thrown vertically at 20.0m/s from the surface of the earth. With what speed would it have to be thrown at Jupiter, where g=22.5m/s2, in order to reach the same height

For the first question I got

Average speed = (-4+8)/2=2

Velocity= 0

I think this is wrong but i’m Not sure how i’m supposed to do it

For the second question I keep getting weird answers. So can you plz help me

a person cycles to a destination with the wind at 8m/s and returns home without stopping, against the wind, at 4m/s

What is the average speed

What is the velocity

And

A ball is thrown vertically at 20.0m/s from the surface of the earth. With what speed would it have to be thrown at Jupiter, where g=22.5m/s2, in order to reach the same height

For the first question I got

Average speed = (-4+8)/2=2

Velocity= 0

I think this is wrong but i’m Not sure how i’m supposed to do it

For the second question I keep getting weird answers. So can you plz help me

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#2

(Original post by

I don’t understand these questions

a person cycles to a destination with the wind at 8m/s and returns home without stopping, against the wind, at 4m/s

What is the average speed

What is the velocity

And

A ball is thrown vertically at 20.0m/s from the surface of the earth. With what speed would it have to be thrown at Jupiter, where g=22.5m/s2, in order to reach the same height

For the first question I got

Average speed = (-4 8)/2=2

Velocity= 0

I think this is wrong but i’m Not sure how i’m supposed to do it

For the second question I keep getting weird answers. So can you plz help me

**Fadhi**)I don’t understand these questions

a person cycles to a destination with the wind at 8m/s and returns home without stopping, against the wind, at 4m/s

What is the average speed

What is the velocity

And

A ball is thrown vertically at 20.0m/s from the surface of the earth. With what speed would it have to be thrown at Jupiter, where g=22.5m/s2, in order to reach the same height

For the first question I got

Average speed = (-4 8)/2=2

Velocity= 0

I think this is wrong but i’m Not sure how i’m supposed to do it

For the second question I keep getting weird answers. So can you plz help me

And for the second one is it just 20/9.81 (g on earth) then times that by g on the other planet (not so sure about this one tho pretty sure my answer to the first one is right tho)

Last edited by teilchen; 1 year ago

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it’s says on the paper that neither answer is 6 and that I need to think of the time for each journey

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#4

(Original post by

1) A person cycles to a destination with the wind at 8 m/s, returns home without stopping against the wind, at 4 m/s. Find the average: speed, velocity

2) A ball is thrown vertically at 20 m/s from the surface of the earth. With what speed must it be thrown at from Jupiter, where g = 22.5 m/s^2, to reach the same height.

**Fadhi**)1) A person cycles to a destination with the wind at 8 m/s, returns home without stopping against the wind, at 4 m/s. Find the average: speed, velocity

2) A ball is thrown vertically at 20 m/s from the surface of the earth. With what speed must it be thrown at from Jupiter, where g = 22.5 m/s^2, to reach the same height.

= 2x/(x/8 + x/4) = 2/(3/8) = 16/3 m/s

average velocity = total displacement/total time = 0

2) Earth: u = 20, a = -g, v = 0: 0 = 400 - 2gs => s = 200/g

Jupiter: a = -22.5, s = 200/g, v = 0: 0 = u^2 - 45*200/g

=> u = sqrt(9*5*100*2/g) = 30sqrt(10/g) m/s

Last edited by Physics Enemy; 1 year ago

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