
William M. answered 05/11/16
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Experienced Science teacher! All levels!
KE = 1/2 * m * v2
a) m = 100 g= .1 kg
v = 100 m/s
KE = 1/2 (.1kg)(100 m/s)2
=500 J
b)
electron m = 9.1 × 10-31 kg
v = .999c = .999*3.0 x 108 m/s =2.997 x 108
KE = 1/2 (9.1 × 10-31 kg)(2.997 x 108)
= 4.09 x 10-14 J
Rest energy is determined by
E=mc2
completely dependent on mass so the ball.