A skater is a mass of 50 kg slides across an icy pond with negligible friction. As he approaches a frienD, both he and his friend hold out their hands, and the friend exerts a force in the direction opposite to the skater's movement, which slows the skater's speed from 2.0 m/s2 to 1.0 m/s2. What is the change in the skater's kinetic energy?
A A 20 N block is attached to the end of a rope and the rope is looped around a pulley system. If you pull the opposite end of the rope a distance of 2.0 m, the pulley system raises the block a distance of 0.40 m. What is the pulley system's ideal mechanical advantage?
A 4N soccer ball sits motionless on a field. A player's foot exerts a force of 5N on the ball for a distance of 0.1 m, and the ball rolls a distance of 10m. How much kinetic energy does the ball gain from the player?