A man of weight 500 newtons walks up to the top of a building of height of 20 m above the street level. The increase in the potential energy of man is
Correct answer: B. 500 x 20J
- A. 5/9.8J
- B. 500 x 20J
- C. 500/9.8 J
- D. 500/20/9.8J
Explanation
The explanation of this question is: Increase in potential energy P.E. = Final P.E. - Initial P.E. Now P.E.= mgh where m = mass and g = gravtional accelaration mg = weight = 500 N and h = 20 m so final P.E. = 500 x 20 and initial P.E. = 0 (height = 0) so increase in P.E. = 500 x 20
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About Potential Energy
Potential energy is energy stored because of position or configuration, including gravitational potential energy near Earth's surface and elastic energy in a stretched or compressed spring. Questions use changes in potential energy and conservation of mechanical energy, while distinguishing a chosen reference level from an absolute zero of energy.
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