Height of the Qutab Minaar is 73 metre. When the last stone on the top of the Qutab Minaar was carried from ground to its top by labour weighting 50 kg (bricks carried weighted 20kg), how much work was done in that job by gravitational force? (g = 10 m/s2)
(d) –12770J
(a) –32110 J
(b) –51100 J
(c) –76990J
