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19. A bucket full of water is on the first flooryour house and another identical bucketwith same quantity of water is kept on the secondfloor. Which of the two has greater potentialenergy?20. Write the expression for the gravitationalpotential energy explaining the meaning of thesymbols used.21. A body of mass m is moved from ground to aheight h. If force of gravity on mass of 1 kg is gnewton, find : (a) the force needed to lift the body.(b) the work done in lifting the body and (c) thepotential energy stored in the body. |
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