Escape Speed

The acceleration due to gravity

At a height above the earth's surface, the acceleration due to gravity is





but (given)

It is given that, acceleration due to gravity on plane is times the acceleration due to gravity on planet B ie,
.......(i)
From third equation of motion

At planet A, ......(ii)
At planet B, ......(iii)
Dividing E (ii) by E (iii), we have

From E (i),
=
or

AC