Question

The mass of a regulation tennis ball is 57.0 g (although it can vary slightly), and tests have shown that the ball is in contact with the tennis racket for 30 ms. (This number can also vary, depending on the racket and swing.) We assume a 30.0 ms contact time in this problem. In the 2011 Davis Cup competition, Ivo Karlovic made one of the fastest recorded serves in history, which was clocked at 156 mph (70 m/s) 1.) What impulse (in N⋅s) did Karlovic exert on the tennis ball in his record serve? 2.) What average force (in N) did Karlovic exert on the tennis ball in his record serve? 3.) If his opponent returned this serve with a speed of 55.0 m/s, what impulse (in N⋅s) did his opponent exert on the ball, assuming purely horizontal motion? 4.) If his opponent returned this serve with a speed of 55.0 m/s, what average force (in N) did his opponent exert on the ball, assuming purely horizontal motion?

          The mass of a regulation tennis ball is 57.0 g (although it can vary slightly), and tests have shown that the ball is in contact with the tennis racket for 30 ms. (This number can also vary, depending on the racket and swing.) We assume a 30.0 ms contact time in this problem. In the 2011 Davis Cup competition, Ivo Karlovic made one of the fastest recorded serves in history, which was clocked at 156 mph (70 m/s)

1.) What impulse (in N⋅s) did Karlovic exert on the tennis ball in his record serve?
2.) What average force (in N) did Karlovic exert on the tennis ball in his record serve?
3.) If his opponent returned this serve with a speed of 55.0 m/s, what impulse (in N⋅s) did his opponent exert on the ball, assuming purely horizontal motion?
4.) If his opponent returned this serve with a speed of 55.0 m/s, what average force (in N) did his opponent exert on the ball, assuming purely horizontal motion?

Added by Juan Manuel M.

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