physics

a 1.50 kg book is sliding along a rough horizontal surface. At point A it is moving at 3.21 m/s, and at point B it has slowed to 1.25m/s.
1.) How much work was done on the book between A and B?
2.) If -0.750 J of work is done on the book from B to C, how fast is it moving at point C?
3.) How fast would it be moving at C if +0.750 J of work were done on it from B to C?
4.) The book slides a distance of 2.50m from A to B. Determine the coefficient from A to B whilst using constant-force work formula to recalculate the answer to #1.)

I'm having real trouble with this problem.

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  1. Horizontal surface, no change in PE.
    a) work done is by friction...what is the difference in KE
    b) same principle
    c) same principle
    4) friction=work/distance
    mu*mg=work/distance solve for mu

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    bobpursley
  2. Ok. Thanks! Now I can have my starting point. Thank you.

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  3. a jogger run around a square city block with sides of 30m. if she start an end at point a what distance has she run

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