A man carries a 1 kg suitcase horizontally across the corridor and then goes up the stairs of total height of 10 m. The work done by the man due to force of gravity is:
Correct answer: D. 98 J
- A. 0 J
- B. 196 J
- C. 4.9 J
- D. 98 J
Explanation
W horizontal = mgh cos 90 = 0W vertical = mgh = (1)(9.8)(10) = 98 JW total = W horizontal + W vertical= 0 + 98 = 98J
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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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