A spring of negligible mass has force constant k = 1500 N/m
How far must the spring be compressed so that 3.50 J
of potential energy is stored in it?
Express your answer in meters.

You place the spring vertically with one end on the floor. You then drop a 1.30 kg
book onto it from a height of 0.900 m
above the top of the spring. Find the maximum distance the spring will be compressed.
Express your answer in meters