The acceleration due to gravity ( g ) on the surface of the Earth is approximately 2 . 6 times that on the surface of the Mars . Given that the radius of Mars is about one half the radius of the Earth , the ratio of the escape velocity on Earth to that on Mars is approximately . . . . . . . . . . .
a ) 1 . 1
b ) 1 . 3
c ) 2 . 3
d ) 5 . 2
b ) 1 . 3
c ) 2 . 3
d ) 5 . 2



