5. If a force does a positive amount ofwork on an object. does the object's speed increase. decrease. or remain the same? Justify your answer. 6. If a force does a negative amount of work on an object. does the object's speed increase. decrease. or remain the same? Justify your answer. 1 If a force does zero work on an object. does the object's speed increase. decrease. or remain the same? Justify youranswer. B. For the box in question #1 above. determine: a. the total work done on the ho): is. the change in the box's kinetic energy c. the speed of the box at the end of its 5 m trip if its mass is 40 kg and it started from rest. 9. For the box in question #2 above. determine: a. the total work done on the box o. the change in the box's kinetic energy c. the speed of the box at the end of its 20 m trip if it started from rest. 10. Use the workenergy theorem to explain Iilirhy. if you double the speed of a car. the distance required to stop the car will be four tim es as much. Part 4: Potentlal Energy The potential energy of an object is energy an object has due to its position. shape. composition. or condition