Question

A rocket is launched normal to the surface of earth, away from the Sun, along the line joining the Sun and the Earth. The Sun is 3 x 10⁵ times heavier than the Earth and is at a distance 2.5 x10⁴ times larger than the radius of the Earth. The escape velocity from Earth's gravitational field is v_e = 11.2 km s^-1. The minimum initial (v_s) required for the rocket to be able to leave the Sun-earth system is closest to (Ignore the rotation and revolution of the Earth and the presence of any other planet)

(A) v_s = 22 km s^-1

(B) v_s = 42 km s^-1

(C) v_s = 62 km s^-1

(D) v_s = 72 km s^-1

Answer 1

(B) v_s = 42 km s^-1