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A body of mass 10 kg initially at rest a...

A body of mass 10 kg initially at rest acquires velocity `10 ms^(-1)`. What is the work done ?

A

`-500 J`

B

`500 J`

C

`50 J`

D

`-50 J`

Text Solution

Verified by Experts

The correct Answer is:
`(2)`
`W =" Gain in K.E." = 1/2 mv^(2) = 1/2 xx 10xx(10)^(2) = 500 J`
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NARAYNA-WORK , ENERGY & POWER -EXERCISE -III
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  2. A vertical spring with force constant k is fixed on a table. A ball of...

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  3. A body of mass 10 kg initially at rest acquires velocity 10 ms^(-1). W...

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  4. A ball moves on a frictionless inclined table without slipping. The wo...

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  5. Two identical balls A and B collide head on elastically. If velocities...

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  6. Water falls from a height of 60 m at the rate 15 kg//s to operate a tu...

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  7. A shell of mass 200g is ejected from a gun of mass 4 kg by an explosio...

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  8. Two bodies of masses m and 4m are moving with equal linear momenta. Th...

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  9. A body of mass 1 kg is thrown upwards with a velocity 20 ms^(-1). It m...

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  10. An explosion blows a rock into three parts. Two parts go off at right ...

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  11. A body of mass 1 kg is thrown upwards with a velocity 20 ms^(-1). It m...

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  12. An engine pumps water continously through a hose. Water leave the hose...

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  13. A block of mass m attached in the lower and vertical spring The spring...

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  14. A rain drop with radus 1.5 mm falls from a cloud at a height 1200 m fr...

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  15. A ball moves on a frictionless inclined table without slipping. The wo...

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  16. A cord is used to lower vertically a block of mass M through a distanc...

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  17. A child's spring gun when fired vertically sends the ball to a height ...

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  18. A ball of 1 kg drops vetically on to the floor with a speed of 25 m s^...

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  19. Consider the following statement. When jumping from some height, you s...

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  20. A body of mass M at rest explodes into three pieces, two of which of m...

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