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A bullet loses 1//20 of its velocity in...

A bullet loses ` 1//20` of its velocity in passing through a plank. What is the least number of planks required to stop the bullet .

A

11

B

20

C

21

D

infinite

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The correct Answer is:
A
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AAKASH INSTITUTE-WORK, ENERGY AND POWER-Assignment (SECTION - A)
  1. Work done by frictional force

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  2. Under the action of a force, a 2 kg body moves such that its position ...

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  3. A bullet loses 1//20 of its velocity in passing through a plank. What...

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  4. A particle moves along the X-axis from x=0 to x=5 m under the influenc...

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  5. A particle of mass 2kg travels along a straight line with velocity v=a...

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  6. The position x of a particle moving along x - axis at time (t) is give...

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  7. A uniform chain of length L and mass M is lying on a smooth table and ...

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  8. Two bodies of masses m(1) and m(2) have same kinetic energy. The rat...

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  9. Two bodies of different masses m(1) and m(2) have equal momenta. Their...

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  10. KE of a body is increased by 44%. What is the percent increse in the m...

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  11. When momentum of a body increases by 200% its KE increases by

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  12. Two bodies with masses 1 kg and 2 kg have equal kinetic energies. If p...

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  13. The K.E. acquired by a mass m in travelling a certain distance d, star...

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  14. A simple pendulum with bob of mass m and length x is held in position ...

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  15. which a U^(238) nucleus original at rest , decay by emitting an alpha ...

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  16. The total work done on a particle is equal to the change in its kineti...

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  17. Potential energy is defined

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  18. A stick of mass m and length l is pivoted at one end and is displaced ...

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  19. A spring with spring constant k when compressed by 1 cm the PE stored ...

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  20. Two springs have spring constants k(1)and k(2) (k(1)nek(2)). Both are ...

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