Posted by **Jud** on Friday, March 5, 2010 at 4:13pm.

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.

- physics -
**bobpursley**, Friday, March 5, 2010 at 4:19pm
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

- physics -
**Jud**, Friday, March 5, 2010 at 4:24pm
Ok. Thanks! Now I can have my starting point. Thank you.

- physics -
**keke**, Wednesday, September 7, 2011 at 8:42pm
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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