A horizontal force of 150 N is used to push a 47.0 kg packing crate a distance of 6.50 m on a rough horizontal

Question

A horizontal force of 150 N is used to push a 47.0 kg packing crate a distance of 6.50 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following.

(a) the work done by the 150 N force

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(b) the coefficient of kinetic friction between the crate and the surface

Answer 1

a) Work = Force x Distance

          =150N x 6.5 m = 975 Newton meters, or Joules

Don't know b though