Question

@Abhisar
@aaronq
A marble of mass m rolls with initial speed v down a long, horizontal hallway. Eventually, the marble comes to a stop. How much work has friction performed on the marble?

-mv^2
mv^2
-0.5mv^2
0.5mv^2

Answer 1

What do you think it should be ?

Answer 2

I dont think it would b equal to mv^2 so one of the .5

Answer 3

Work done = change in energy.

What is the initial KE of marble ?

Answer 4

.5mv^2

Answer 5

yep, and change in energy is equql to final KE - initial KE = 0-0.5mv^2

Answer 6

Thanks

Answer 7

so the answer would be ?

Answer 8

-.5mv^2

Answer 9

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