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Choose the correct options A ball of ma...

Choose the correct options
A ball of mass 250 g moving with 20 `m//s` strikes a vertical wall and rebounds along the same line with a velocity of 15 `m//s`. If the time of contact is 0.1 s, the force exerted by the wall on the ball is

A

87.5 N

B

12.5 N

C

`-12.5 N`

D

`-87.5 N`

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TARGET PUBLICATION-LAWS OF MOTION-EXERCISE
  1. A body of mass 0.1 kg travelling with a velocity of 5 m/s, collides h...

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  2. A body of mass m moving with velocity 3km//h collides with a body of m...

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  3. Choose the correct options A ball of mass 250 g moving with 20 m//s s...

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  4. Choose the correct options The turning effect of the applied force doe...

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  5. The ability of a force to produce rotational motion is measured by its...

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  6. The direction of torque is given by .

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  7. The unit of moment of force is same as .

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  8. Torque can NOT be given by

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  9. A rigid body is rotating about an axis. The best way to stop it is app...

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  10. What is the torque of force vec F = (2hati -2hatj - 4hatk) N acting at...

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  11. Choose the correct options A mass of 10 kg is suspended from a rope wo...

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  12. is a pair of equal and parallel forces acting in opposite directions a...

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  13. The moment of couple is independent of

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  14. Force applied to open or close a water tap is an example of .

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  15. If the force applied to a body produces rotational motion in an anticl...

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  16. Condition of translational equilibrium of a rigid body is

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  17. 6 m long see-saw remains horizontal when two children weighing 20 kg a...

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  18. Where can the total mass of an object be assumed to be concentrated?

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  19. The centre of mass of two particles lies

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  20. Centre of mass of rectangular lamina lies on

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