The gravitational intensity a region is 10(^i−^j)N/kg. The work done by the gravitational force to shift slowly a particle of mass 1Kg from point (1m,1m) to a point (2m,−2m) is
−10J
−40J
10J
+40J
A
10J
B
−10J
C
+40J
D
−40J
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Solution
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Fg=m→Eg=1(10(^i−^j))=10(^i−^j)N=10^i−10^jN →S=(2^i−2^j)−(^i−^j)=^i−3^jm Work done, →Fg.→S≡(10^i−10^j).(^i−3^j)=10(1)+(−10)(−3)=+40J
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