Cosmic Velocity - Third to Meter per Second

The third cosmic velocity is approximately 16,700 m/s (16.7 km/s), the minimum speed to escape the Sun's gravity from Earth's orbital position.

v₃ = √(v_sun² - v_Earth²) where v_sun is solar escape velocity from Earth's orbit. Approximately 16.7 km/s relative to Earth.

To km/h: × 3,600. To mph: × 37,282. 16.7 km/s = 60,120 km/h = 37,344 mph.

Voyager missions, future interstellar probes, and calculations for leaving the solar system.

Voyager 1: ~17 km/s relative to Sun (achieved via Jupiter gravity assist). Parker Solar Probe: 163 km/s peak (but toward Sun, not away).

Thinking Voyager was launched at 16.7 km/s — it used gravity assists. Also, confusing with speed needed to escape from Sun's surface (618 km/s).

~17 km/s to leave the solar system from Earth's orbit. Voyagers achieved this with gravity assists from planets.

The meter per second is the SI derived unit of speed and velocity, defined as the distance traveled in meters over time in seconds. It represents how many meters an object moves in one second.

1 m/s = base unit. Direct relationship with distance (m) and time (s). Speed = distance ÷ time.

To km/h: × 3.6. To mph: × 2.237. To ft/s: × 3.281. To knots: × 1.944.

Walking speed (1.4 m/s average), running speed (elite sprinters reach 12.4 m/s), vehicle speeds in scientific contexts, and wind speed measurements.

Usain Bolt's top speed: 12.4 m/s (44.6 km/h). Cheetah speed: 29 m/s. Speed of sound at sea level: 343 m/s. Light: 299,792,458 m/s.

Confusing m/s with km/h — a common error when reading speedometers. Remember: multiply m/s by 3.6 to get km/h.

Quick conversion: 10 m/s ≈ 36 km/h. To visualize: 1 m/s means moving one big step per second. Multiply by 3.6 for km/h.