Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 6 - Think and Explain: 52

Answer

Having the wall behind your hand means that the time interval to stop the ball is short, because your hand can't move backward to gradually bring the ball to rest. This requires a large force. Ouch!
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