SSC CHSL 2025 PYQ — Question 90

Calculating Orbital Velocity:

The orbital velocity (v) of a satellite is determined by the following formula:

$v = \sqrt{\frac{GM}{R+h}}$

Where:

G = gravitational constant (6.67 × 10-11 Nm²/kg²)

M = Earth's mass (5.97 × 1024 kg)

R = Earth's radius (approximately 6371 km)

h = satellite's altitude (800 km)

When we plug in these values, the velocity at an altitude of 800 km is approximately 7.45 km/s, rounded to 7.5 km/s.