Gravitation

A rocket is fired vertically with a speed of 5 km s-1 from the earth’s surface. How far
from the earth does the rocket go before returning to the earth ? Mass of the earth
= 6.0 × 1024 kg; mean radius of the earth = 6.4 × 106
m; G = 6.67 × 10–11 N m2 kg–2