A child sleds down a hill and collides at 5.6 m/s into a stationary sled that is identical to his. The child is launched forward at the same speed, leaving behind the two sleds that lock together and slide forward more slowly. What is the speed of the two sleds after this collision?
Two carts on a straight track collide head on. The first cart was moving at 3.6 m/s in the positive direction and the second was moving at 2.4 m/s in the opposite direction. After the collision, the second cart continues moving in its initial direction of motion at 0.24 m/s. If the mass of the second cart is 5.0 times that of the first, what is the mass of the first cart?