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We know that the kinetic energy = (1/2)mV2
where m is the mass of the ball , V is the velocity of the ball .
m = 142.8 gram = 0.1428 kg
V = 90 mph = 40.2336 m/s
Kinetic energy = (1/2)*(0.1428)*(40.2336)2 = 115.578 J
(2) We know that the potential energy = mgh
where m is the mass of the ball , h is height
mgh = 115.578
h = 82.505 m
Professional baseball pitchers can deliver a pitch which can reach the blazing speed of 100 mph...
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