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Work-Energy Concepts

A little red wagon with a mass of 4.60 kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of 10.0m/s and then is pulled 4.0 m by a force with a magnitude of 18.0 N in the direction of the initial velocity.
a) Use the work-energy relation to calculate the wagon's final speed.
b) Calculate the acceleration produced by the force.

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Solution Preview

a) Initial Kinetic Energy of the wagon = ½mv^2 = ½*4.6*102 = 230 J
Work done by the force = Force*displacement in the direction ...