A rocket is fired vertically with a speed ha of the escape speed from the earth surface. How far from the earth does the rocket go before returning to the earth? [Given mean radius of earth is R]
(1) R/3 from earth's centre
(2) 4R/3 from the earth's surface
(3) 4R/3 from the earth's centre
(4) 7R/3 from the earth's surface​