A 7.0 kg steel ball of radius 4.0 cm rolls without slipping from rest down a hill of height 3.0 m. The ball continues to roll without slipping on a horizontal surface for a certain distance before striking a spring whose spring constant, k, is 72 N/m. The spring is originally unstretched. The steel ball compresses the spring until it comes to a momentary stop. The ball does not slip on the surface while it compresses the spring. The surface of contact between the ball and the spring is frictionless. Find the maximum compression of the spring in metres.

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.