Posted by Jodi on Monday, March 12, 2012 at 7:49pm.
The mass of a regulation tennis ball is 62.0 (although it can vary slightly), and tests have shown that the ball is in contact with the tennis racket for 34.0 . (This number can also vary, depending on the racket and swing.) We shall assume a 34.0 contact time throughout this problem. The fastestknown served tennis ball was served by "Big Bill" Tilden in 1931, and its speed was measured to be 73.14 . The impulse for his record serve is 4.53. So, What force did Big Bill exert on the tennis ball in his record serve? Pleas help, I'm stuck.

physics  Danielle, Tuesday, March 13, 2012 at 12:24pm
you need to find the force, but you already have the impulse. So, since the formula deltap=J, and J=F(deltat). You take the impulse 4.53 and divide by the time in seconds, .034s to find the force. the force would be 133 N