1.Using the Law of Conservation of Energy, find the maximum height of a 4.0 x 102 g baseball thrown straight up at an initial speed of 18 m/s.
2. An air-hockey paddle pushes a 48.0 g stationary puck a distance of 50.0 cm on the frictionless surface. When the force is removed the puck is travelling at a speed of 15.8 m/s. What force did the paddle apply to the puck?