1. The problem statement, all variables and given/known data A particle of mass m is released from rest a distance b from a fixed origin of force that attracts the particle according to the inverse square law: F(x) = -kx-2 Show that the time required for the particle to reach the origin is Pi times (mb3/8k)1/2 2. Relevant equations I have no idea what you need 3. The attempt at a solution I am sad to say I have no clue how to even star this one. Any help would be nice, just don't give me the answer just yet.