ball with a mass of 0.10 kg has a velocity of 7 m/s. It strikes a concrete wall perpendicularly and bounces straight back with velocity of 4 m/s. The change in the ball's momentum was equal to Response Answer Choices a. 0.30 kg m/s b. 0.10 kg m/s c. 0.40 kg m/s d. 1.1 kg m/s 0.1 x 7 and .4 x .1 = .7 and .4 and subtracting them gives .30 kg m/s, correct?