Answer 2_5_7
What is the kinetic energy of a 4 kg shot-put thrown by an athlete at a speed of 15 m/s?
Kinetic energy = 1/2 mv2
= 1/2 x 4 kg x (15 m/s)2 = 1/2 x 4 kg x 225 m2/s2 = 450 J
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