An object of mass 9 kg, starting at rest, slides down a slope without friction or air resistance, dropping through a height of 9 m. At the bottom of the slope, it moves horizontally and collides with the stationary object of mass 3 kg. They stick together and move off as one object.
a) What is the speed of the first mass when it reaches the horizontal plane? Enter the value of u in m/s.
b) After the collision, what is the speed of the two objects together? Enter the value of v in m/s.