State what Hooke’s law says.
The spring is compressed by $4.0\,\text{cm}$. The block has a mass of $0.025\,\text{kg}$. Calculate the spring constant of the spring.
Show that the work done in compressing the spring by $4.0\,\text{cm}$ is $0.48\,\text{J}$.
The block is then released and speeds up along the tube as the spring returns to its original length. It emerges from the end of the tube with a speed of $6.0\,\text{m s}^{-1}$. Calculate the kinetic energy of the block as it leaves the end of the tube.
Assume that the spring has negligible kinetic energy when the block leaves the tube. Determine the average resistive force opposing the block as it travels along the tube.
Determine the efficiency of the transfer from elastic potential energy in the spring to the block’s kinetic energy.