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A) Work done by frictional force is alwa...

A) Work done by frictional force is always negative
B) A body at rest can have mechanical energy
C) Mechanical energy of freely falling body decrease gradually

A

Only A is true

B

Only B is true

C

Only C is true

D

All the three are true

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-WORK, POWER & ENERGY -EXERCISE - I
  1. A constant force acts on a body which is intially at rest. If a graph ...

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  2. A heavy stone is thrown from a cliff of height h with a speed v. The s...

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  3. A) Work done by frictional force is always negative B) A body at res...

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  4. The work done by all the forces (external and internal) on a system eq...

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  5. . (A): Mountain roads rarely go straight up the slope. (R): Slope o...

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  6. body is allowed to fall from a height h above the ground. Then match t...

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  7. . A curve is drawn expressing the kinetic energy of a particle as a fu...

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  8. . A body is moving unidirectionally under the influence of a source of...

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  9. Which of the diagrams shown below most closely shows the variation in ...

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  10. . A raindrop falling from a height .h. above ground, attains a near te...

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  11. Two inclined frictionless tracks, one gradual and the other steep meet...

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  12. A heavy stone is thrown from a cliff of height h in a given direction....

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  13. 40. Which of the diagrams correctly shows the change in kinetic energy...

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  14. A particle is acted upon by a force of constant magnitude which is alw...

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  15. Two spheres A and B collide. If the momentum of A is doubled in the co...

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  16. Internal forces can change

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  17. (A): Mass and energy are not conserved separately, but are conserved a...

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  18. Two bodies A and B of masses m, and m, moving with velocities V(1) and...

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  19. Two particles of equal masses have an elastic collision, the target pa...

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  20. . A bullet hits a block at rest on a frictionless horizontal surface a...

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