You have a 0.7 kg block poised 0.05 m above the top of a spring, with spring constant = 800 N/m. You let the block go from rest. Ignore drag in this problem. For each instant, use E = Kinetic + Uspring + Ugravity. If any of these are zero at any instant, justify that with a phrase.
1) What is the speed of the block just as it hits the top of the spring?
2) What is the speed of the block when it has compressed the string 0.03 m?
