A spring of spring constant k sits on a frictionless horizontal
surface, one end of the spring is attached to a wall, the other end
to a block of mass M, also resting on the frictionless surface. The
system executes simple harmonic motion such that at a given point
the mass is -1/6 of the amplitude moving away from equilibrium, and
0.5 seconds later it has 1/7 of the maximum speeds, moving towards
equilibrium, having passed equilibrium once.
1) How...