A mass m1 on a horizontal shelf is attached by a thin stringthat passes over a frictionless pulley to a 2.4 kg mass (m2) thathangs over the side of the shelf 1.2 m above the ground. The systemis released from rest at t = 0 and the 2.4 kg mass strikes theground at t = 0.86 s. The system is now placed in its initialposition and a 1.2 kg mass is placed on top of the block of massm1. Released from rest, the 2.4 kg mass now strikes the ground in1.3 seconds.
(a) Determine the mass m1.
(b) Determine the coefficient of kinetic friction betweenm1 and the shelf.
