a) while the spring is being compressed, what work is done on the block by the gravitational force on it? 1.078 j (b) what work is done on the block by the spring force while the spring is being compressed? 0.308 j (c) what is the speed of the block just before it hits the spring? (assume that friction is negligible.) m/s (d) if the speed at impact is doubled, what is the maximum compression of the spring?