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A block of mass 10 kg slides down a roug...

A block of mass `10 kg` slides down a rough slope which is inclined at `45^(0)` to the horizontal. The coeffficient of sliding friction is `0.30`. When the block has to slide `5m`, the work done on the block by the force of friction is nearly

A

`115 J`

B

`-75 sqrt J`

C

`321.4 J`

D

`-321.4 J`

Text Solution

Verified by Experts

The correct Answer is:
`(2)`
`W = -f xx S = - mu mg cos theta xx s`
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NARAYNA-WORK , ENERGY & POWER -EXERCISE -II (C.W)
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  3. A block of mass 10 kg slides down a rough slope which is inclined at 4...

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  4. A uniform rope of length 'L and linear density 'mu' is on a smooth ho...

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  5. A long rod ABC of mass "m" and length "L" has two particles of masses ...

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  6. A particle of mass 0.5kg travels in a straight line with velocity v=ax...

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  7. A block of mass M is kept on a platform which starts accelerating upwa...

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  8. In the figure shown all the surfaces are frictionless, and mass of the...

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  9. Three components of a force acting on a particle are varying according...

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  10. A force vec F = (3 vec i + 4vec j)N, acts on a particle moving in x-y...

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  11. Two inclined frictionless tracks, one gradual and other steep meet at ...

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  13. If the mass of a moving body decreased by one third of its initial mas...

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  14. The kinetic energy of a moving body is given by k = 2v^(2), k being in...

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  17. The potential energy of a body mass m is U=ax+by the magnitude of acce...

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  18. A block of mass M is hanging over a smooth and light pulley through a ...

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  19. The kinetic energy K of a particle moving along x - axis varies its po...

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  20. Figure given below shows the plot of the conservative force F, in a un...

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