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Q.

A satellite of mass  is orbiting close to the surface of the earth (Radius R = 6400 km) has a kinetic energy . The corresponding kinetic energy of the satellite to escape from the earth’s gravitational field is

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a

K

b

2K

c

mgR

d

mK

answer is B.

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Detailed Solution

K=GMm/2R. (K')=(1/2)m×2GM/R.
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A satellite of mass  is orbiting close to the surface of the earth (Radius R = 6400 km) has a kinetic energy . The corresponding kinetic energy of the satellite to escape from the earth’s gravitational field is