Question

The value of escape velocity on a certain planet is 2km/s. Then the value of orbital speed for a satellite orbiting close to its surface is ___________

(a) 12km/s

(b) 1km/s

(c) √2km/s

(d) 2√2km/s

The question was posed to me in a national level competition.

My question is from Gravitational and Gravity topic in division Gravitation of Engineering Physics I

Answer 1

Right answer is (c) √2km/s

For explanation: Near earth’s surface,

v0=ve/√2=2/√2=√2 km/s.