6. . 0.25kg block is dropped onto a spring that is at its equilibrium position. The spring has a spring constant of ESUme. The block compresses the spring [3.12m before it momentarily stops. When the spring is compressed : a) what is the work done on the block by the gravitational force? b} what is the work done on the block by the spring force? c} what is the speed of the block just before it hits the spring? d} If the speed is doubled at impact, how much does the spring compress