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A box was lifted vertically through a he...

A box was lifted vertically through a height of 6m in 3s . If the box would have been lifted in a zig-zag way in 5 s ,work done would have been same. Is the statement true or false ?

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A box is lifted vertically by 6m in 3 s. (i) If the box is lifted to the same height in a zig-zag way what would be the change in the work done ?

A box is lifted vertically by 6m in 3 s. (ii) if the box is lifted in 5 s instead of in 3 s , what would be the change in the work done ?

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Free downwared motion of body is stopped in 1 s on application of an upward force when the body has fallen through 10 m. Another force would have stopped the body in 2 s. find the ration between the two forces. (g = 9.8 m cdot s^(-2) )

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CHHAYA PUBLICATION-WORK AND ENERGY-EXERCISE (Very short Answer Type Questions)
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  2. What is the work done by the tension in the string during the oscillat...

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  3. A box was lifted vertically through a height of 6m in 3s . If the box ...

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  4. 1 kg *m=…………J . [Fill in the blank]

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  5. A force vecF =(5hati+3hatj+2hatk)N acts on a particle , and the partic...

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  6. How many jouls are in 1 MeV ?

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  7. What is the unit of energy ?

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  8. Does the kinetic energy of a ball, thrown inside a moving train, depe...

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  9. Which type of energy is lost in doing work against friction ?

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  10. A small car and a lorry are moving with the same kinetic energy . Bra...

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  11. When a body falls on the ground from a height ,it becomes slightly war...

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  12. Is the resistance due to air a conservative force ?

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  13. What happens to internal energy , when temperature of body increases ?

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  14. What type of energy is stored in the spring of a watch ?

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  15. Kinetic energies of a heavy and a light object are the same. Momentum ...

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  16. Momenta of a light and a heavy body are the same .Which body has great...

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  17. If E is the kinetic energy of a body of mass m, what will be its momen...

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  18. An object breakes up into two masses m1 and m2 due to explosion. The ...

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  19. What is the loss of KE of a freely falling body of mass m , during th...

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  20. The increase in momentum of a body is 100% . What will be the increa...

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