posted by Rachel .
A block of mass m is dropped onto a relaxed spring constant k. The block becomes attached to the spring and compresses the spring a distance d before momentarily stopping. (Use any variable or symbol stated above along with the following as necessary: g for the acceleration of gravity.)
(a) While the spring is being compressed, what work is done on the block by the gravitational force on it?
(b) While the spring is being compressed, what work is done on the block by the spring force?
(c) What is the speed of the block just before it hits the spring?