how does kinetic energy changes if its velocity changes from 18 km /h to 72 km /h and mass of body id 50 kg.
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Kinetic Energy = 1/2 m( v^2- u^2)
1/2 * 50 * ( 20 - 5) [ As 18 km/h = 5m/s and 72 km/h = 20 m/S]
1/2 * 50 * 15
375 joule
Thus 375 joule of kinetic energy changes
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