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Work done = Change in kinetic energy
mass = 20 kg
initial velocity = 5 m/s
final velocity = 2 m/s
initial kinetic energy = 1/2 * 20 * 5*5 = 250 J
final kinetic energy = 1/2 * 20 *2*2 = 40 J
change in kinetic energy = 40 - 250
= -210 J
Work done = -210 J
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