1. The problem statement, all variables and given/known data A point mass rests on a horizontal platform which can be made to describe vertical s.h.m. of amplitude 0.10m and frequency 2.0 Hz. The mass makes contact with the platform as it rises from its lowest point. At what point, if any, will this contact be lost? 2. Relevant equations shm equations 3. The attempt at a solution i'm thinking that this will happen at the top, x = 0.1 m, where after instantaneous zero velocity, the platform will be attracted to a larger extent downwards than the particle. but then the answer is x = 62 mm. i don't understand.