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How much energy is gained by a box of ma...

How much energy is gained by a box of mass 20 kg when a man
(a) carrying the box waits for 5 minutes for a bus?
(b) ruins carrying the her with a speed of 3 m `s^(-1)` to catch the bus?
(c) raises the box by 0.5 m in order to place it inside the bus? 10 `m s^(-2)`

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(a) Zero (b)90 J (c )100 J
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ICSE- WORK ENERGY AND POWER-EXERCISE-2(B) (NUMERICALS)
  1. A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate : (i...

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  2. Calculate the height through which a body of mass 0.5 kg is lifted if ...

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  3. A boy weighing 25 kgf climbs up from the first floor al a height of 3 ...

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  4. A vessel containing 50 kg of water is placed at a height of 15 m above...

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  5. A man of mass 50 kg climbs up a Indder of height 10 m. Calculate : (i)...

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  6. A block A, weighing 100 N is pulled up a slope of length 5 m by means ...

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  7. Find the kinetic energy of a body of mass 1 kg moving with a uniform v...

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  8. If the speed of a car is halved, how does its kinetic energy change?

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  9. Two bodies of equal masses are moving with uniform velocities v and 2v...

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  10. Two bodies A and B have masses in the ratio 5 : 1 and their kinetic en...

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  11. A car is running at a speed of 15 km h^(-1) while another Similar car ...

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  12. A ball of mass 05 kg slows down from a speed of 5 m s^(-1) to that of ...

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  13. A cannonball of mass 500 g is fired with a speed of 15 ms^(-1) . Find ...

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  14. A body of mass 10 kg is moving with a velocity of 20 m s^(-1) . If the...

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  15. A truck eighine 1000 kg changes its speed from 36 km h^(-1) to 72 km h...

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  16. A body of mass 60 kg has momentum of 3000 km s^(-1) Calculate : (i) th...

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  17. How much work is needed to be done on a ball of mas 50 g to give it a ...

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  18. How much energy is gained by a box of mass 20 kg when a man (a) carr...

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  19. A bullet of mass 50 is moving with a velocity of 500 ms^(-1) . It pene...

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  20. A spring is kept compressed by a small trolley of mass ring 0-5 kg ly...

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