- #1

- 71

- 0

can i use this formula?

J=FT=pf-pi=mv

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- Thread starter nrc_8706
- Start date

- #1

- 71

- 0

can i use this formula?

J=FT=pf-pi=mv

- #2

Doc Al

Mentor

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- #3

Tide

Science Advisor

Homework Helper

- 3,089

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What would you use for the time?

I suggest asking yourself how much work the frictional force does.

I suggest asking yourself how much work the frictional force does.

- #4

- 71

- 0

is it W=Kf-Ko ?

- #5

- 217

- 0

yes, but make sure not to forget that the work done by friction will be negative.

- #6

- 71

- 0

so.....W=1/2mVf^2-1/2mVo^2 does Vf cancel since it comes to rest?

- #7

- 217

- 0

yes, it does

- #8

- 71

- 0

the answer is W=456.3 is that all?

- #9

- 217

- 0

you've found the work, but the question wants to know the force. so what is the equation for work?

- #10

- 71

- 0

is it W=Fd

- #11

- 217

- 0

yes, that's right

- #12

- 71

- 0

Thank You So Much!!!!!!

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