21. Which of the following is not an example of potential energy?
22. Which of the following notable activities, potential energy has been converted into kinetic energy.
23. If someone travels 15 km distance with a fixed force of 500N, then calculate the work done.
24. A worker takes 15kg object and put the object 1 meter above on his head from the surface of earth. Then work done by the worker is- (g = 10 ms-2).
25. A person picks up 25 kg of weight from the ground and puts it 2.5 meters above from the ground on his head if g = 10 m/s2 then work done by the person is-
26. Which of the following energy varies with the height of an object?
27. Consider the following statement and conclusions which can be drawn from it. Choose the correct conclusion.
Statement: In starting a loaded cart, one has to push harder than to keep it moving.
Statement: In starting a loaded cart, one has to push harder than to keep it moving.
28. If the displacement of an object is zero. Then work done by the applied force is-
29. A person picks up 20kg of goods at 2m above the ground and keeps it on his head, work done by the person is?
30. Which of these objects does not have kinetic energy?
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