Newton's third law states that when an object exerts a force on another object, the second object exerts an equal but opposite force on the first object. which of the following shows an example of this? a. a bumper car crashes into a wall, causing it to bounce backwards. b. a woman presses on both sides of a box with equal force. c. a moving cart becomes more difficult to stop as more mass is added to it. d. a parked car sits in the same place for two weeks until another car runs into the back of it.