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NDA 2023 GAT · General Knowledge · Motion, Forces and Gravitation · medium

Escape speed is/are correct? 1. It depends on the mass of the projectile. 2. Its value for the Earth is about 11.2 km/s.

Single correct option

Which of the following statements about escape speed is/are correct?
1. It depends on the mass of the projectile.
2. Its value for the Earth is about 11.2 km/s.
  1. A. 1 only
  2. B. 2 only
  3. C. Both 1 and 2
  4. D. Neither 1 nor 2
Show answer and solution

Answer: (B) 2 only

Escape speed is √(2GM/R) and contains only the mass and radius of the planet, so it is independent of the projectile mass; statement 1 is wrong. The value for the Earth is about 11.2 km/s, so statement 2 is correct.
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Original question written in the NDA 2023 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake