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How much work must work be done by a for...

How much work must work be done by a force on 50 kg body in order to accelerate it in the direction of force from rest to `20 ms^(-1)` is 10 s?

A

`10^3 J`

B

`10^4 J`

C

`2XX10^3J

D

`4XX10^4 j`

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SL ARORA-Work, Energy and power-EXERCISE
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  15. A spring of force constant 800N//m has an extension of 5cm. The work d...

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  18. A block of mass m initially at rest is dropped from a height h on to a...

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  19. A 15 gm ball is shot from a spring whose spring has a force constant o...

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