L3
L2
L1
T/2
T
(d) The block is released at time t = 0. The length of the spring is shown in the graph above as a function of time. During which interval(s), if any, is the weight force acting on the block greater than the spring force acting on the block? Explain your reasoning.
(e) When the block reaches its lowest point after oscillating several times, the student attaches a new block of mass m < M to the block of mass M without exerting any noticeable force to the block of mass M or changing the energy stored in the spring at that instant. In a clear, coherent, paragraph-length response that may reference equations, explain how the graph of length vs. time will change and why.