Work, Power and Energy TEST 7. Which of the graphs below best represents the relationship between gravitational potential energy (PD) and an object's height (h) above the ground? A PE C PE B PE D PE 8. The picture shows a 20.0 kilogram cart coasting along at the bottom of a hill that is 12.0 meters high, in order for the cart to reach the top of the hill, how much kinetic energy must it have at the position shown? A 9,80 1 B 2401 C 23501 12.0 m D 4670J 20.0 kg 9. A boy rides in an elevator that moves him upward at a constant velocity of 1.5 m/s. As the boy rises, how do his gravitational potential energy and kinetic energy change? A Gravitational potential energy decreases and kinetic energy remains the same B Gravitational potential energy decreases and kinetic energy increases C Gravitational potential energy remains the same and kinetic energy decreases Gravitational potential energy increases and kinetic energy remains the same 10. When sliding a block in a straight line across a floor, the magnitude of work done on the box depends mostly on the - A time required to move the box speed at which the box is moved B total distance the box is moved direction of the motion of the box