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A ball of mass 200g falls from a height of 5 meters. What is its kinetic energy when it just reaches the ground? |
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Answer» Mass = 200 g = 0.2kg Height = 5m Initial velocity, u = 0 Acceleration due to gravity, g = 9.8 m/s2 Final velocity, v Using third equation of motion, v2 – u2 = 2gs v2 = 98 Kinetic energy = ½ mv2 Kinetic energy = (½)(0.2)(98) = 9.8J |
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