body of mass 12kg is moving with a velocity of 6m/s. Calculate its Kinetic Energy
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11th
Physics
Work, Energy and Power
Kinetic Energy
A body of mass 10 k g is mo...
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Asked on January 17, 2020 by
Shuchita Mishrikotkar
A body of mass 10kg is moving with a velocity 20ms
−1
. If the mass of the body is doubled and its velocity is halved, find the ratio of the initial kinetic energy to the final kinetic energy.
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ANSWER
Given , Mass of object ,m=10 kg
Velocity of object , v=20ms
−1
Initial Kinetic energy , K
1
=
2
1
×10×20
2
=2000 J
Now Final mass ,m
2
=20 kg
Final Velocity , v
2
=10m/s
Final Kinetic energy , K
2
=
2
1
×20×10
2
=1000 J
Required Ratio=
K
2
K
1
=
1000
2000
=2
Answered by
2
Explanation:
- kE= 1/2 * mv ^2
- = 1/2 * 12 * 6*6
- = 216kgm/s = 216J
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