In the following figure = 20.0 and = 51. The coefficient of kinetic friction between the block and the incline is = 0. What must be the mass of the...

In the following figure = 20.0 and = 51.4. The coefficient of kinetic friction between the block and the incline is = 0.40. What must be the mass of the hanging block if it is to descend 15.0 in the first 3.00 after the system is released from rest?