alleryThe escape velocity from Earth's surface is approximately
A1 km/s
B11.2 km/s
C30 km/s
D3 × 10⁸ m/s
Answer & Solution
Correct answer: B. 11.2 km/s
1. Escape velocity is the minimum speed needed to escape Earth's gravity from its surface.
2. Formula: v_esc = √(2 g R) = √(2 G M / R).
3. Evaluating for Earth gives about 11.2 km/s.
4. It does not depend on the mass of the escaping object.
_Source: syllabus Physics, Ch 7 "Gravitation", §7.7_
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