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Work done on changing direction of a tennis ball
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[QUOTE="Simon Bridge, post: 4940160, member: 367532"] You don't need calculus - you already know the equations for momentum and work. ... that's not too bad. Work is the change in energy ... since the kinetic energy of the ball is unchanged during the collision we can conclude that the [i]net[/i] work done on the ball to change it's direction is zero (not counting energy that changes the temperature of the ball, make that thwacking noise, swing the racquet etc.) However, Work is also force times distance ... the ball clearly experiences a force (it's momentum changes) which acts over some distance (as the ball and racquet squash together)... [/QUOTE]
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Work done on changing direction of a tennis ball
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