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Exam 2 Fall 2005 Solutions

# Exam 2 Fall 2005 Solutions - KLI/A*rswEtS PHYSICS221 FALL...

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3 I . A 100-9 ball traveling at 20 m/s horizontally to the left is hit by a racket. The ball and the racket are in contact for 0.2 ms. As a result of the blow, the ball leaves the racket traveling to the right at anangle of 45 degrees with the horizontal, at20 m/s. What is the magnitude of the average force exerted by the racket on the ball? A . 0 B. 7.7 x 103 N ,/-a., acj 1.8 x lo4 N D 2 . 0 x l 0 a N E. 2.5 x l}a N 32. A 20-kg child stands on a 10-kg wagon that rolls at2.0 m/s to the right. The child jumps to the left, at 1.0 m/s relative to the ground. Compare the change in momentum of the child and the change in momentum of the wagon. A. AF"n'o = -4LF*^ron B. Ap"n,,o = -2LF*uron l r \9 AF"n,,o : -Ll*uron D. AF.n,,o : &*ugon E. AF"n,,o = 2LF*unon
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