Answers

2014-02-01T11:28:29+05:30
The escape velocity is the velocity with which an object is to be projected to overcome the gravitational pull of  the earth
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2014-02-06T22:48:01+05:30
Escape energy is the energy at which the object is thrown out of gravitational field
potential energy=-GMeM/Re
ESCAPE ENERGY=POTENTIAL ENERGY+KINETIC ENERGY=0
SO 
KINETIC ENERGY=-POTENTIAL ENERGY
1/2MV2=GMeM/R
V2=2GMe/R
NOW GRAVITATIONAL ACCELERATION=GMe/R2
V2=2gR
SO ESCAPE VELOCITY IS THE VELOCITY AT WHICH THE OBJECT IS THROWN OUT OF GRAVITATIONAL FIELD
FOR EARTH  IT IS 11.2KM/S
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