Question

Particle of mass m is thrown upwards from the surface of the earth, with a velocity u. The mass and the radius of the earth are, respectively, m and r. G is gravitational constant and g is acceleration due to gravity on the surface of the earth. The minimum value of u, so that the particle does not return back to the earth, is

Answer 1

Answer:

GM=gR

2

V

e

=

2gR

=

2

R

2

GM

R=

R

2GM

.

Answer 2

Explanation:

Gm=gr

2

V

e

=2gR

=

2

R

2

GM

R=

R

2GM