Manipal Entrance Test 2013 Physics Paper

Gravitational force provides the required centripetalforce.
The gravitational force provides the required centripetal force in orbit of earth. ∴

GMeM

R2

=

mv02

R

v0=√

GMe

R

kinetic energy =

1

2

mv02
∴ KE=

1

2

m(

GMe

R

)2∕2
=

1

2

mGMe

R

KE∝

1

R