Question

The escape velocity from the Earth is:

• A. 11.2 km/s
• B. 7.8 km/s
• C. 11.2 km/h
• D. 7.8 km/h

Answer 1

Answer:

A. 11.2 km/s

The escape velocity from the Earth is the minimum speed an object must have to escape the Earth's gravitational pull.

Calculation:

The escape velocity (v) can be calculated using the formula:

v = √(2 G M / r)

where:

• G is the gravitational constant (6.67408e-11 N*m²/kg²)

• M is the mass of the Earth (5.97237e24 kg)

• r is the radius of the Earth (6.371e6 m)

Value:

Plugging in the values, we get:

v ≈ √(2 6.67408e-11 5.97237e24 / 6.371e6)
≈ 11.2 km/s