drummerking70 drummerking70

24-01-2017
Physics

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The fast server in women's tennis is Venus Williams, who recorded a serve of 130 mi/h (209 km/h) in 2007 If her racket pushed on the ball for a distance of 0.11 m, what was the average acceleration of the ball during her serve?

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scme1702 scme1702

30-01-2017

209 km/h = 58.0 m/s

2as = v² - u²
Assuming the ball started from rest,

a = (58)² / 2 x 0.11

a = 15,290 m/s²

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