A red block (mr=2kg) is released from rest and slides down a slope. At the bottom it collided with a blue block (mb=0.5kg). They stick together after the collision. a) what is the velocity of the blocks immediately after the collision?

b) the blocks then slide into a ruff area offering 4N of friction. How many seconds does it take for the blocks to come to a rest?

c) How far has it travelled in the first 3s of moving in the sand zone?