William M. answered • 05/11/16

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KE = 1/2 * m * v

^{2}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}kgv = .999c = .999*3.0 x 10

^{8}m/s =2.997 x 10^{8}KE = 1/2 (9.1 × 10

^{-31}kg)(2.997 x 10^{8}) = 4.09 x 10

^{-14}JRest energy is determined by

E=mc

^{2}completely dependent on mass so the ball.