Posted by **mrmr** on Wednesday, January 19, 2011 at 7:36pm.

A person pushes a 14.0-kg lawn mower at constant speed with a force of F = 88.0 N directed along the handle, which is at

an angle of 45.0º to the horizontal (Fig. 4–45). (a) Draw the free-body diagram showing all forces acting on the mower.

Calculate (b) the horizontal friction force on the mower, then (c) the normal force exerted vertically upward on the mower

by the ground. (d) What force must the person exert on the lawn mower to accelerate it from rest to 1.5 m s in 2.5 seconds,

assuming the same friction force?

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