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A bullet emerges out from a wooden plant...

A bullet emerges out from a wooden plant with 75% of its initial kinetic energy. The number of additional planks required to stop the bullet is

A

2

B

3

C

4

D

5

Text Solution

Verified by Experts

The correct Answer is:
B
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A rifle bullet loses 1/20th of its velocity in passing through a plank. What will be the least number of such planks required to just stop the bullet ?

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AAKASH SERIES-WORK, POWER & ENERGY -PRACTICE EXERCISE (EMERGY)
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  2. A ball is released from a height of 10 m. If it loses 20% of its energ...

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  3. A car moving with a velocity of 72 KMPH stops its engine just at the f...

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  4. A force of 100 acts on a body of mass 5 kg at rest for 4s. If te body ...

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  5. A simple pendulum is swinging in vertical plane. The ratio of its pote...

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  6. A block of mass 1 kg is dropped on a spring from a height of 20 cm. I...

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  7. A simple pendulum is swinging in a vertical plane. Its highest point a...

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  8. Two force 10 N each inclined to each other at angle 120^(@) act on a 6...

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  9. If two bodies of masses 3 gm and 5 gm are moving with linear momenta ...

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  10. If the momentum of a body moving with constant velocity is four times ...

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  11. A car without passengers moving with a constant velocity can be stopp...

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  12. A bullet emerges out from a wooden plant with 75% of its initial kinet...

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  13. A particle of mass .m. is moving in a horizontal circle of radius .r....

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  14. A person of mass 40 kg standing on a smooth horizontal plane of ice th...

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  15. The masss of an athlete is 40 kg. He can cover a distance of 150m is m...

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  16. A partical is projected up from a point at an angle theta whith the ho...

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  17. When a body is projected vertically up from ground, the ratio of its p...

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  18. Two bodies of masses 2 kg and 8 kg are at rest. If same force acts on ...

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  19. When a mass .m. is attached to a vertical spring and slowly released, ...

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  20. A ball is projected vertically down with a velocity of 10sqrt(3) m//s ...

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