A block with a mass of 0.700 kg is dropped from a heightd above a spring, which has a spring constant of 400 N/m.The block sticks to the spring and presses it down 0.140 m.
a) How much work is done by the block on the spring?
b) How much work is done by the spring on the block?
c) What is the height dfrom which the block was dropped?