posted by Bill Burger .
M1 has a mass of 5.01 kg. It is on a horizontal surface, connected by a light string to a hook. Mass M2 can be increased smoothly by adding masses little at a time. The pulley has a negligible mass and no friction.
When M2 is 2.40 kg it begins to accelerate downwards at a rate of 1.52 m/s2. Calculate s -k for M1 on the surface.