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Physics
Physics
Problem
To project a body of mass
m
m
m
from earth's surface to infinity, the required kinetic energy is (assume, the radius of earth is
R
e
R_e
R
e
,
g
=
g =
g
=
acceleration due to gravity on the surface of earth) : (1)
2
m
g
R
e
2mgR_e
2
m
g
R
e
(2)
m
g
R
e
mgR_e
m
g
R
e
(3)
1
2
m
g
R
e
\frac{1}{2}mgR_e
2
1
m
g
R
e
(4)
4
m
g
R
e
4mgR_e
4
m
g
R
e
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