We know that the kinetic energy = (1/2)mV^{2}
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
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