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A ball is dropped a height h. The veloci...

A ball is dropped a height h. The velocity of the ball when it reaches the ground is `10ms^-1`. Find h.

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MODERN PUBLICATION-WORK AND ENERGY-EXERCISE
  1. A boy of mass 50 kg runs up a staricase of 45 steps in 9 s. If the hei...

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  2. An electric bulb of 60 W is used for 6 hours per day. Calculate the un...

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  3. A ball is dropped a height h. The velocity of the ball when it reaches...

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  4. When a body falls freely towards the earth, then its total energy.

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  5. A car is accelerated on a levelled road and attains a velocity 4 times...

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  6. In case of negative work the angle between the force and displacement ...

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  7. A girl is carrying a school bag of 3 kg mass on her back and moves 200...

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  8. Which one of the following is not the unit of energy?

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  9. The work done on a object does not depend upon the

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  10. Water stored in a dam possesses

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  11. A body is falling from a height h. After it has fallen a height h/2, i...

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  12. Two electrodes are maintaned at a potential difference of 100 V. An e...

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  13. A car with K.E. 100 J is moving on a horizontal road. Now 200 J work i...

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  14. Two bodies with kinetic energy in the ratio of 4:1 are moving with equ...

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  15. A certain household has consumed 250 units of electric energy during a...

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  16. If mass is doubled and velocity is halved then new kinetic energy is

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  17. When the force retards the motion of the body, the work done is :

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  18. In which of the following examples, work done is negative?

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  19. In which of the following applications is work is not done?

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  20. For a force to do maximum work, what should be the angle between force...

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