A small battery-powered car moves along the top of a table with a constant speed until it hits a barrier and rebounds to move in a different direction and at a different angle to its original motion. (See the illustration.) The batteries produce the same amount of energy after the car rebounds from the barrier as when the car approached the barrier. Based on an analysis of the situation, which of the following is true about the car? The car experienced a change in acceleration during the interaction with the wall.
The force, mass, and velocity of the car were constant throughout the interaction.

A change in acceleration must bring about a change in speed and the speed of the car is constant with the same amount of energy; hence there is no change in acceleration.

The changing direction of the car changes the speed.