Posted by **ally** on Friday, February 25, 2011 at 7:49pm.

Part 1

A block of mass 4 kg, which has an initial

speed of 8 m/s at time t = 0, slides on a

horizontal surface.Find the magnitude of the work that must

be done on the block to bring it to rest.

Answer in units of J.

Part 2

If a constant friction force of magnitude

5 Newtons is exerted on the block by the surface, ﬁnd the magnitude of the acceleration of

the block.

Answer in units of m/s2.

Part 3

How far does the block slide before it comes

to rest?

Answer in units of m.

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