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A man standing on the edge of the roof o...

A man standing on the edge of the roof of a `20 m` tall building projects a ball of mass `100 gm` vertically up with a speed of `10 ms^(-1)`. The kinetic energy of the ball when it reaches the ground will be `[g = 10 ms^(-2)]`

A

`5 J`

B

`20 J`

C

`25 J`

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
`(3)`
`K.E_(f) = K.E_(i) + P.E_(i)`
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NARAYNA-WORK , ENERGY & POWER -EXERCISE - 1 (C.W)
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  2. A meter scale of mass 400 gm is lying horizontally on the floor. If it...

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  3. A man standing on the edge of the roof of a 20 m tall building project...

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  4. The kinetic energy of a body is 'K'. If one-fourth of its mass is remo...

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  5. An inelastic ball falls from a height of 100 metres. It loses 20% of i...

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  6. A woman weighing 63 kg eats plum cake whose energy content is 9800 cal...

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  7. A spring of spring constant 5 xx 10^(2) Nm is streched initially by 5 ...

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  8. A spring with spring constant K when stretched through 1 cm, the poten...

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

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

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

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

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

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  14. A block of mass 4 kg is initially at rest on a horizontal frictionless...

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  15. On increasing the speed of a bosy to 2ms^(-1), its kinetic energy is q...

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  16. A bullet of mass 10 gm strikes a target at 400 m//s velocity and does...

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

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

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

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

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