QUESTION 13 The potential energy of a mass on a spring is 4.1 J when it is compressed 12 cm to the left of its equilibrium position. This is its leftmost position. What is the kinetic energy of the system when it next returns to the equilibrium point? QUESTION 14 Suppose you have two cars, and the larger one is twice as massive as the smaller one. If you and a friend push on them so that their accelerations are equal, how must the forces applied to the cars compare? O A. The force on the larger car is equal to that on the smaller car O B. The force on the larger car is 1/2 that on the smaller car. O C. The force on the larger car is more than three times that on the smaller car. O D. The force on the larger car is twice that on the smaller car