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!
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 6 - Think and Explain - Page 106-107: 52
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