A man carries an object of mass 50 kg to the top of a tower of 80 m high. Calculate the work done by the man.

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Solution

Given:
The mass of the object $m = 50 k g$
Height of the tower $h = 80 m$
Finding the force required in carrying the object:
Let $g$ be the acceleration due to gravity. Its value is $10 m s^{- 2}$
Force applied on the object, $F = m g = 50 \times 10 = 500 N$
Finding the work done on carrying the object:
Distance through which the object is moved, $s = h = 80 m$
Work done $W = F \times s = 500 \times 80 = 40, 000 J o u l e s$
Hence, work done on carrying the object to a height of 80 m = 40,000 Joules.

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