An old man was standing on a bus stand carrying a very heavy luggage. Saurabh was
looking at the old man and finding him uncomfortable, requested him to put down the
luggage and helped him in doing so.
a. Did the old man do any work while holding the luggage?
b. What is the equation for work done against gravity?
c. If the mass of luggage is 15 kg and height of the old man is 1.60 m. What would be
the potential energy?
d. What is the SI unit of potential energy?
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Answer:
a. no work is done by the man because force is perpendicular to displacement
b. work done by gravity is. mgh
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