Posted by Rob on Wednesday, July 18, 2012 at 8:06pm.
workapplied=39cosine22.6*1m=
work doneonbook= 1/2* 4 *1.75^2
work friction= work applied-work done
39 cos22.6*(1 meter) is the work done by the force, in joules. Subtract the final kinetic energy from that. That will be the work done against friction.
The work done. BY friction is negative
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