Hi, please help me answer the following problem:

Problem 4 A block of mass my = 0.30 kg sits on a frictionless ramp that makes an angle of 0 = 21" with the horizontal. The block is released from rest at a height yo =9.0 cm above the ground. 4. (a): 7 points How long does 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