A mass on a horizontal table is attached by a thin string thatpasses over a frictionless, massless pulley to a 3 kg mass thathangs over the side of the table 1.5 m above the ground. The systemis released from rest and the 3 kg mass strikes the ground at 0.9 slater. The system is now placed in its initial position and a 1.2kg mass is placed on top of the block of mass m1 . Released fromrest, the 3 kg mass now strikes the ground 1.3 s later. Theacceleration of gravity is 9.81 m/s^2.

a) find mass m1
b) find the coefficient of kinetic friction between m1 and thetable

The method I used for part A resulted in the incorrect answer, soit seems I don't know how to approach the problem in the firstplace.

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