Q. 76

A man is instructed to carry a package from the base camp at B to submit A of a hill at a height of 1200 metres. The man weighs 800 N and the package weighs 200 N. If g = 10 m/s2,

(i) How much work does man do against gravity?

(ii) What is the potential energy of the package at A if it is assumed to be zero at B?

Answer :

(i) Weight of the man = 800N

Weight of the package = 200N


Total weight = 800 + 200 = 1000N


Height of the hill = 1200m


g = 10m/s2


Work done = mass × height × g


= 10 × 1200 × 1000


= 12, 00, 000 J


= 12 × 105 J


(ii) Given, Weight of the package (mg) = 200N, h = 1200m


P.E = m x g x h


= 200 × 1200 × 10


= 24 × 105 J


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