Q. 9

An object of mass 5 kg falls from a height of 5 m above the ground. The loss of potential energy of the mass is :
A. 250 J

B. 25 J

C. 2.5 kJ

D. 50 J

Answer :

Given,

Mass = 5kg


Height = 5m


Let g = 10 ms-2


Potential energy stored in a body of mass m and height ‘h’ will be given by


= m × g × h


= 5 kg×10 ms-2×5m


= 250 J


When the mass falls completely, same potential energy is lost = 250 J

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