Roughly 1 gram = 15.4 grains and 1 mph = 1.47 fps, so a car weighing 1 metric ton doing 30 mph has kinetic energy of (30 * 1.47)^2 * 1000000 * 15.4 / 450240, about 66500 FPE!
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Roughly 1 gram = 15.4 grains and 1 mph = 1.47 fps, so a car weighing 1 metric ton doing 30 mph has kinetic energy of (30 * 1.47)^2 * 1000000 * 15.4 / 450240, about 66500 FPE!
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