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The workdone to accelerate a body from 3...

The workdone to accelerate a body from `30 ms^(-1)` to `60 ms^(-1)` is three times the work done to accelerate it from `10 ms^(-1)` to `'v'`. The value of `'v'` in `ms^(-1)` is

A

30

B

`20 sqrt 2`

C

`30 sqrt 3`

D

`10 sqrt 10`

Text Solution

Verified by Experts

The correct Answer is:
`(4)`
`W = 1/2 mv^(2) - 1/2 mu^(2)`
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NARAYNA-WORK , ENERGY & POWER -EXERCISE - 1 (C.W)
  1. A ship of mass 3xx10^7kg initially at rest, is pulled by a force of 5x...

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

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

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

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

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

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

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

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

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

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

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  12. A body of mass 2kg is projected vertically up with velocity 5ms^(-1). ...

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  13. A force F = (2 vec i + vec j + vec k)N is acting on a particle moving ...

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  14. The power of water pump is 4 kW. If g=10 ms^(-2), the amount of water ...

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  15. From a waterfall, water is falling down at the rate of 100kg / s on th...

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  16. A crane can lift up 10,000 kg of coal in 1 hour form a mine of 180 m d...

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  17. A pump is required to lift 600 kg of water per minute from a well 25 m...

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  18. A cable pulls a box with force of 5 kN and raises it at the rate of 2 ...

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  19. An electric motor in a crane while lifting a load produces a tension o...

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  20. An electric motor operates with an efficiency of 90%. A pump operated ...

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