If you were standing on a cart that was at rest and free to roll (ignore friction) and someone threw a 10 kg ball at you, you would
A. roll backward faster if you caught the ball higher above the ground.
B. roll backward faster if the ball bounced off of you elastically.
C. not move if you caught the ball because you are more massive than the ball.
D. roll backward faster if you caught the ball.
Answer: B
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