Define kinetic energy. State its SI unit. Derive its expression.
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the kinetic energy of a body is directly proportional to its mass and square of its velocity. Its SI unit is joule. (ii) Mass of the object, m = 10 kg, velocity of the object, v = 5m s^-1. KE = 1/2 mv^2 = 1/2 x 10 x (5)^2 = 125 J.
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