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The kinetic energy of a body is 'K'. If ...

The kinetic energy of a body is `'K'`. If one-fourth of its mass is removed and velocity is doubled, its new kinetic energy is

A

`K`

B

`3 K`

C

`4 K`

D

`9K/4`

Text Solution

Verified by Experts

The correct Answer is:
`(2)`
`KE = 1/2 mv^(2), KE. = 1/2 m.(v.)^(2)
m. = 3m/4, v. = 2v`
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NARAYNA-WORK , ENERGY & POWER -EXERCISE - 1 (C.W)
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  7. A spring with spring constant K when stretched through 1 cm, the poten...

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  8. The energy required to accelerate a car from 10 m/s to 20 m / s is how...

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  9. A body moving with a kinetic energy of 6J cmes to rest at a distance o...

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  10. A ship of mass 3xx10^7kg initially at rest, is pulled by a force of 5x...

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  11. A vehicle of mass 1000 kg is moving with a velocity of 15 ms^(-1).It i...

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  12. The workdone to accelerate a body from 30 ms^(-1) to 60 ms^(-1) is thr...

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  16. An object is acted on by a retarding force of 10 N and at a particular...

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  17. A body of mass 2 kg is thrown up vertically with kinetic energy of 490...

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  18. A body is falling under gravity . When it loses a gravitational potent...

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  19. A block of mass 4 kg slides on a horizontal frictionless surface with ...

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  20. At what height above the ground must a mass of 5 kg be to have its PE ...

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