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# M2 Question watch

1. I need help with this question.

So for part A i thought you do Force x Distance. So did 0.04 x 8000 to get 320J

Part b: Equation to use is 1/2mv^2 - 1/2mu^2
1/20.025 (v^2-200^2)=320
Rearrage to get V^2
Then Solve- however I get 40root41. Which is 256 approx...

Any help?
Thanks
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2. (Original post by Xphoenix)
I need help with this question.

So for part A i thought you do Force x Distance. So did 0.04 x 8000 to get 320J

Part b: Equation to use is 1/2mv^2 - 1/2mu^2
1/20.025 (v^2-200^2)=320
Rearrage to get V^2
Then Solve- however I get 40root41. Which is 256 approx...

Any help?
Thanks
You have your equation in part b the wrong way round.
3. (Original post by zetamcfc)
You have your equation in part b the wrong way round.
Can you explain what you mean? tried swapping V and U around and it still doesn't come out with the right answer
4. (Original post by Xphoenix)
Can you explain what you mean? tried swapping V and U around and it still doesn't come out with the right answer
It should do.

Solve for v.

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