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Work, Power And Energy
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05/11/2021 10:13 am
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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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05/11/2021 10:14 am
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 = \(\frac{1}{2}\) mv2
Kinetic energy = (\(\frac{1}{2}\))(0.2)(98) = 9.8J