Question

A worker pushing a 35.0-kg wooden crate at a constant speed for 13.7 m along a wood floor does 390 J of work applying a constant horizontal force of magnitude F0 on the crate.Determine the value for F0.
Work is applied force times distance.

F0 * 13.7 m = 390 J
F0 = 28.5 N

The speed does not matter. Neither does the weight.
A worker pushing a 35.0-kg wooden crate at a constant speed for 10.0 m along a wood
floor does 350 J of work by applying a constant horizontal force of magnitude F on the crate.
(a) Determine the value of F.
(b) Calculate the coefficient of kinetic friction.
(c) If the worker now applies a force greater than F, describe the subsequent motion of the
crate.
(d) If the work was done in 8 seconds, what is the average power?

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