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An object of mass 2 kg is moving with co...

An object of mass 2 kg is moving with constant velocity of 4 `ms^(-1)` on a frictionless horizontal surface. If the object is to be kept moving with the same velocity, the magnitude of the external force required would be ....... N.

A

32

B

0

C

2

D

8

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KUMAR PRAKASHAN-FORCE AND LAWS OF MOTION-QUESTIONS AND ANSWERS( Choose the correct option from those given below each question :)
  1. What change would occur in acceleration. if the external force acting ...

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  2. Which of the following physical quantity is scalar?

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  3. If a force of 5N acts on an object of mass 2 kg for 2 s. then = what w...

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  4. If a constant force is applied to an object of mass 0.9 kg in stationa...

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  5. What is the momentum of an object of mass m, moving with a velocity v ...

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  6. Momentum of an object is 28 kg ms^(-1). If its velocity is 1.4 ms^(-1)...

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  7. A ball of mass m collides with the ground with velocity and then comes...

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  8. When is the momentum of an object zero?

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  9. kg ms^(-2) is the unit of which physical quan tity?

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  10. On applying force in opposite direction of motion of an object, what e...

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  11. On applying a force of 5N to an object, if acceleration equal to 10 ms...

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  12. A goalkeeper in the game of the football move his hands backwards in o...

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  13. Which of the following statements is not true for an object performing...

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  14. According to the Newton's third law of motion action free and reaction...

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  15. The object due to the property of Inertia can…..

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  16. A traveller tosses a coin in upward direction during his journey in a ...

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  17. An object of mass 2 kg is moving with constant velocity of 4 ms^(-1) o...

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  18. On which principle of conservation does a rocket work?

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  19. A tanker, moving with uniform speed on a horizontal linear road is fil...

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  20. A batsman hits a cricket ball which then rolls on a level ground. Afte...

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