Please help me answer the following question (2 sig figs!):

Problem 4 A black of mass m1 = [1.30 kg sits on a frictionless ramp that makes an angle of 45' = 21 with the horizontal. The black is released Erem rest at a height ya = 9J3 cm sheave the ground. (a): T points How long dues it take the block to reach the end of the ramp? [b]: 6 points What is the speed of the block when it reaches the end of the ramp? (c): 7 points If the block then strikes another block of mass my = 0.20 kg that sits at rest at the bottom of the ramp, and the blocks stick together and move forwards on a frictionless surface, what is the final speed of the blocks