A body of mass 10kg moving with a velocity of 1m/s is acted upon by a force of 50N for two seconds . The final velocity of the body is
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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
=2:1
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