Posted by Allison on Sunday, July 10, 2011 at 8:48pm.
A tennis racket is in contact with a 55 kg ball for 0.0050 s changes the ball's velocity from 30 m/s [E] to 40 m/s [W] over a distance of 0.0001 m. how much work is done on the tennis ball by the racket?

Physics  Work  bobpursley, Sunday, July 10, 2011 at 9:55pm
Force*distance=work
but force*time=mass*changevelocity
or force= 55*(70)/.0050 Notice the 70 as change of velocity, figure that out.
One remark: I would hate to hit a 55kg ball, geepers, that is bigger than some of my high school students.
Put that force into the first work equation.
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