Asked by Alex

When served at 200 km/h (124 mph), what is the equivalent weight exerted on the tennis ball?
Answered by djoko
it is one of:
a box of mineral water (15 kg)
Andy Murray and Novak Djokovic (162 kg)
Four bags of cement (200 kg)
Tiger (320 kg)
Answered by djoko
f=ma
m = 0.057kg
a = 55.6 ms
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