The mass of a regulation tennis ball is 57.0 g (although it can vary slightly),
ID: 1443728 • Letter: T
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 35.0 ms . (This number can also vary, depending on the racket and swing.) We assume a 35.0 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 mi/h (70 m/s). Part B What average force did Karlovic exert on the tennis ball in his record serve?
Explanation / Answer
net force F = m*acceleration
F = m*dv/dt = 57*10^-3*70/(35*10^-3) = 114 N
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