A tennis ball with a velocity of 9.45 m/s to the right is thrown perpendicularly at a wall. AFter striking the wall, the ball rebounds in the opposite direction with a velocity of -7.48 m/s to the lef

A tennis ball with a velocity of 9.45 m/s to the right is thrown perpendicularly at a wall. AFter striking the wall, the ball rebounds in the opposite direction with a velocity of -7.48 m/s to the left. If the ball is in contact with the wall for 0.011 s, what is the average acceleration of the ball while it is in contact with the wall?