A Jack-in-a-box is a children's toy, where a doll (the "jack"), attached to a compressed spring, is secured in a closed box. The box is resting on a smooth horizontal surface when it is knocked over, causing the lid of the box to open. The energy stored in the spring is released and the doll is propelled out of the box along the horizontal surface. If the spring has a spring-constant 36 N/m, how much energy (in Joules) was stored in the spring if the base of the doll moves 0.9 m out of the box.

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Spring Potential Energy

The potential energy is the energy possessed by a body by virtue of its position or the energy held by the object due to its position relative to other objects, its force like stresses, charge, and other factors affecting the particles of the body. The potential energy is the measure of the net work done by or on the body. The spring potential energy is the potential energy stored due to the deformation of an elastic spring and this elasticity is due to the stretched spring. The elasticity is the ability of a solid-state matter to come back to its equilibrium position or original position after any kind of external force is acted on it. It is also known as Elastic potential energy. The potential energy here is caused due to the displacement of the spring from its equilibrium position to another position and this potential energy is equal to the net work done due to the stretching of the spring. It also resembles the same mechanics of the oscillation of a simple pendulum, where due to the external force, the object moves from its equilibrium position to its maximum ends and the periodic motion continues till it comes back to the equilibrium position to rest.