A bowling ball is dropped from a height of onto a spring. If the spring is to compressed before halting the ball, what is the spring constant of the spring?

A block with mass is attached to a vertically hanging spring with negligible mass and spring constant and is allowed to reach a new equilibrium position. Approximately how far does the spring stretch from its initial equilibrium position?

Supposed that an object attached to a spring with a spring constant of is displaced by a certain amount. The elastic potential energy contained within the spring is . What is the magnitude of the force acting on the object from the spring at this instant?