2. A 1.5 kg block collides with a massless spring that has a spring constant of 1250 N/m. The block compresses the spring 1.0 cm before it comes momentarily to rest. (a) What was the initial velocity of the block? (b) What was the impulse on the block by the spring? by the spring on the block? (c) If the block rebounds from the spring with the same speed it started with, what is the total impulse on the block during the whole compression and return? On the spring? Useful identities: sin (0) + cos (0) = 1 v = v / + v I