question_answer

The gravitational field in a region is given by \[\overset{\to }{\mathop{g}}\,=5N/kg\hat{i}+12N/kg\hat{j}.\]The change in the gravitational potential energy of a particle of mass 1 kg when it is taken from the origin to a point (7 m, – 3 m) is:      [JEE ONLINE 19-04-2014]

A)  71 J                            

B)  13 58 J

C)  71 J                

D)  1 J

Correct Answer: D

Solution :

[d] Gravitational field,

i.e., change in gravitational potential 1 J/kg.

Hence change in gravitational potential energy 1 J