A body of mass 10 kg is moving with a speed of 5 ms. Another body of mass 10 kg is moving with a speed of 100 ms Calculate the ratio of the KE of both bodies :
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Case of first mass
Mass = 10 kg
Velocity = 5 m/s
KE = 1/2 mv²
= 1/2 * 10 * 5²
= 1/2 * 10 * 25
= 5 * 25
= 125 J
Case of second mass
Mass = 10kg
Velocity = 100m/s
KE = 1/2 mv²
= 1/2 * 10 * 100²
= 1/2 * 10 * 10000
= 5 * 10000
= 50000 J
Therefore ratio of KE = 125 / 50000
= 1/400
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