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Work done by the gravitational force on ...

Work done by the gravitational force on a body of mass `''m''` moving on a smooth horizontal surface through a distance `'s'` is

A

mgs

B

`-mgs`

C

Zero

D

`2mgs`

Text Solution

Verified by Experts

The correct Answer is:
`(3)`
`W = vec F. vec S = FS cos theta and theta = 90^(@)`
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NARAYNA-WORK , ENERGY & POWER -EXERCISE - 1 (C.W)
  1. A person holds a bucket of weight 60 N. He walks 7 m along the horizon...

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  2. If a force vec(F) = (vec(i) + 2 vec(j)+vec(k)) N acts on a body produc...

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  3. Work done by the gravitational force on a body of mass ''m'' moving on...

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  4. A body of mass 1kg is made to travel with a unitform acceleration of 3...

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  5. A force F is applied on a lawn mower at an angle of 60^(@) with the ho...

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  6. A weight lifter jerks 220 kg vertically through 1.5 metre and holds st...

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  7. A force F=(2+x) acts on a particle in x-direction where F is in newton...

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  8. KE of a body is increased by 44%. What is the percent increse in the m...

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  9. A 120 g mass has a velocity vecv=2hati+5hatj m s^(-1) at a certain ins...

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  10. A body of mass 5 kg initially at rest is subject to a force of 20 N. W...

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  11. If a body of mass 3 kg is droped from the top of a tower of height 25 ...

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  12. A uniform cylinder of radius 'r' length 'L' and mass 'm' is lying on ...

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  13. A meter scale of mass 400 gm is lying horizontally on the floor. If it...

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

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

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

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

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

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

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

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