A bullet of mass 0.06 kg strikes a 5.0 kg block having an initial speed of 225 m/s. The block is joined to a spring. The friction among the block and the table is negligible. Upon impact the bullet bounces back from the box having a speed of 75 m/s.
As an outcome of the collision the spring compress to a maximum of 0.2 m. Determine the spring constant.