1.

For an object of 1kg mass to escape the gravitational force of the earth, the kinetic energy imparted to it from the surface of the earth is approximately _____(a) 5600 J(b) 10200 J(c) 11200 J(d) 12000 JI got this question in final exam.My question is taken from Kinetic Energy topic in section Work, Energy and Power of Physics – Class 11

Answer»

Right option is (a) 5600 J

To EXPLAIN I WOULD say: Escape velocity of EARTH from the surface (v) = 11.2 km/s

 = 11,200 m/s

KE = (1/2) X m x v^2

 = (1/2) x 1 x 11,200

 = 5600 J.



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