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An object is made to fall from different...

An object is made to fall from different heights 20 cm, 40 cm and 60 cm on a wet sand.
Explain the reasons of your observation.

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MODERN PUBLICATION-WORK AND ENERGY-EXERCISE
  1. Calculate the electricity bill amount for a month of April, if 4 bulbs...

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  2. An object is made to fall from different heights 20 cm, 40 cm and 60 c...

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  3. An object is made to fall from different heights 20 cm, 40 cm and 60 c...

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  4. Define power. A boy of mass 45 kg climbs up 20 steps in 20 sec. it eac...

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  5. A truck and a car are running with same velocity. Which of the tow has...

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  6. Give an example of electrical energy converted into light energy.

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  7. What are two types of potential energy? Give two examples of each.

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  8. Define K.E. and derive the expression for K.E.

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  9. The kinetic energy of a body of mass 15 kg is 30 J . What is its momen...

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  10. An object of mass 15 kg moving with a uniform velocity of 4ms^-1. What...

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  11. What is the work to be done to increase the velocity of a car form 30 ...

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  12. Find the energy possessed by an object of mass 10 kg when it is at a h...

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  13. A boy of mass 50 kg runs up a staricase of 45 steps in 9 s. If the hei...

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

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

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

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

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

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

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

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