Question

A spring is compressed by a toy cart having mass 150 g. On releasing the cart, it moves with a speed of 0.2 m/s. Calculate the elastic potential energy of the spring.

Answer 1

$$\begin{gathered} Kineticenergyofthestringisconvertedintothepostentialenergyofthespring. \\ \frac{1}{2}m{v}^2 \\ =\frac{1}{2}\times \frac{150}{1000}\times 0.2\times 0.2 \\ =0.003joule \end{gathered}$$