Question

Orbital velocity of earth's satellite near the surface is 7 km/s. When the radius of the orbit is 4 times than that of earth's radius, then orbital velocity in that orbit is

• A. 3.5 km/s
• B. 7 km/s
• C. 72 km/s
• D. 14 km/s

Answer 1

Answer: (A)

3.5 km/s

Answer 2

If orbital radius becomes 4 times then orbital velocity will become half. i.e. $\frac { 7 } { 2 } = 3.5 \mathrm {~km} / \mathrm { s }$