A mass on a spring oscillates up and down. As | vedclass

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(C) $1$. At the highest point of oscillation,the spring is stretched to its maximum extent. As the mass moves downward toward the equilibrium position

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The net force is downward,the net work done on the mass is positive and the mass speeds up.

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(C) $1$. At the highest point of oscillation,the spring is stretched to its maximum extent. As the mass moves downward toward the equilibrium position,the restoring force (spring force) acts in the upward direction,but the net force (gravity minus spring force) is directed downward.$2$. Since the net force is in the same direction as the displacement (downward),the work done by the net force is positive $(W = F \cdot d > 0)$.$3$. According to the work-energy theorem,positive work done on an object increases its kinetic energy,meaning the mass speeds up as it approaches the equilibrium position.

$A$ mass on a spring oscillates up and down. As the mass moves downward from its highest point to its equilibrium point:

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