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# m2 help- work energy principle

Maths and statistics discussion, revision, exam and homework help.

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1. m2 help- work energy principle
can somebody tell em the best way to format the qeustions like this
i always find it hard and mke a mistake
the teach sed write it out like this:
initial energy + work done by engine- work done against friction=final energy
i have a question which i got wrong using this method
can someone pelase go through each step
thank you
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2. m2 help- work energy principle
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3. Re: m2 help- work energy principle
(Original post by Braniac101)
can somebody tell em the best way to format the qeustions like this
i always find it hard and mke a mistake
the teach sed write it out like this:
initial energy + work done by engine- work done against friction=final energy
i have a question which i got wrong using this method
can someone pelase go through each step
thank you
Kinetic energy going into the block - work done by the block = energy of bullet leaving the block

So in numbers: 500 - 220 = enery of bullet post block.

Now lets assume all this energy goes to kitetic energy.

0.5mv^2 = 180.

Bit of basic rearanging from there and you have the answer.
4. Re: m2 help- work energy principle
(Original post by importunate)
Kinetic energy going into the block - work done by the block = energy of bullet leaving the block

So in numbers: 500 - 220 = enery of bullet post block.

Now lets assume all this energy goes to kitetic energy.

0.5mv^2 = 180.

Bit of basic rearanging from there and you have the answer.
Looking at the OP's post it is quite likely that he is doing edexcel maths, the edexcel M2 exam was today, so you are late.
5. Re: m2 help- work energy principle
(Original post by raheem94)
Looking at the OP's post it is quite likely that he is doing edexcel maths, the edexcel M2 exam was today, so you are late.
DAM STRAIGHT
a solid exam
who reckons 71 will get you 100 ums as arsey suggested?
6. Re: m2 help- work energy principle
(Original post by Braniac101)
DAM STRAIGHT
a solid exam
who reckons 71 will get you 100 ums as arsey suggested?
I don't know if it will get you 100, though the moments question was a bit ambiguous.

I got 90UMS for scoring 71 raw marks last year, though i was to blame for it as i made mistake in a very easy 'show that' question.

Good luck

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