Physic problem.... springs A 700g block is released from rest at height Ho(initial) above a vertical spring with spring constant k=400 N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 19.0 cm. How much work is done A) by the block on the spring? B) by the spring on the block? C) what is the value of Ho? D) If the block were released from height 2H0 above the spring, what would be the maximum compression of the spring? If someone could help me figure where to start and the formulas substituted it would be much appreciated!!!