A man does 4,300 J of work in the process of pushing his 2.90 x 103 kg truck fro

Question

A man does 4,300 J of work in the process of pushing his 2.90 x 103 kg truck from rest to a speed of v, over a distance of 28.0 m. Neglecting friction between truck and road, determine the following (a) the speed v m/s (b) the horizontal force exerted on the truck Physical Constants Reading A warehouse worker is pushing a 90.0-kg crate with a horizontal force of 294 N at a speed of v 0.850 m/s across the warehouse floor. He encounters a rough horizontal section of the floor that is 0.75 m long and where the coefficient of kinetic friction between the crate and floor is 0.355. (a) Determine the magnitude and direction of the net force acting on the crate while it is pushed over the rough section of the floor. direction (b) Determine the net work done on the crate while it is pushed over the rough section of the floor. (c) Find the speed of the crate when it reaches the end of the rough surface

Explanation / Answer

9.

(a)

From work energy theorem,

Work done = Change in KE

W = (1/2)m(v^2 - 0) = 4300

4300 = (1/2)*2900*v^2

v = 1.72 m/s

(b)

W = F.x

4300 = F . 28

F = 153.57 N

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