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A satellite is moving with a constant speed v in circular orbit around the earth. An object of mass ‘m’ is ejected from the satellite such that it just escapes from the gravitational pull of earth. At the time of  ejection, the kinetic energy of the object is :

(a)

 

(b)

 

(c)

2

(d)

 



Question ID - 50220 | SaraNextGen Top Answer

A satellite is moving with a constant speed v in circular orbit around the earth. An object of mass ‘m’ is ejected from the satellite such that it just escapes from the gravitational pull of earth. At the time of  ejection, the kinetic energy of the object is :

(a)

 

(b)

 

(c)

2

(d)

 

1 Answer
127 votes
Answer Key / Explanation : (b) -

At height r from center of earth. Orbital velocity

=

 By  energy conservation

KE of ‘m’ + =0+0

(At infinity, PE=KE=0)

⇒KE of ‘m’= =  m=

127 votes


127