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10) a bullet weighs 235 grams (1 grain= 0.0648g) moving at 2520 ft/s. Calculate Kinetic energy...

10) a bullet weighs 235 grams (1 grain= 0.0648g) moving at 2520 ft/s. Calculate Kinetic energy in J. 2.54cm =1 in

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Answer #1

Kinetic energy , KE = (1/2) mv2

Where

m = mass of bullet = 235 g x ( 10-3 kg/g) = 235 x10-3 kg

v = velocity of bullet = 2520 (ft/s) x (1m /3.28 ft) = 768.3 m/s

Plug the values we get KE = (1/2)x(235 x10-3 kg) x ( 768.3 m/s)2

                                       = 69.3 x103 J

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