Question

Serena Williams can serve a tennis ball with 750 Newtons of force. The ball and racquet are in contact for 0.003 seconds. What is the impulse exerted on the tennis ball? Impulse = F ∙ t Question 5 options: 0.0004 N∙s 2.25 N∙s 250,000 N∙s

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Answer 1

2.25 Newton.seconds

Impulse is a rate of change of the momentum. It is calculated as a product of the average force over a time interval. Both measures are given here, so we can just apply the formula:

(impulse) = (avg. force) x (duration) = (750 N) x (0.003 s) = 2.25 N.s