NEET 2023 Phase 2 · PhysicsEscape energyPrevious Year Question
The escape velocity of a body from the earth's surface is 11.2 km/s. If the same body is projected upward with velocity 22.4 km/s, its velocity at infinite distance from the centre of the earth will be:
Answer: (B) 11.2√3 km/s. Correct Answer (B): 11.2√3 km/s Solution: ½v∞² = ½u² − ½vₑ² with u = 2vₑ: v∞² = (4−1)vₑ² = 3vₑ² ⇒ v∞ = 11.2√3 km/s.
- A.11.2 km/s
- B.11.2√3 km/s✓
- C.11.2√2 km/s
- D.Zero
Correct Answer
(B) 11.2√3 km/s
Solution & Explanation
Correct Answer (B): 11.2√3 km/s Solution: ½v∞² = ½u² − ½vₑ² with u = 2vₑ: v∞² = (4−1)vₑ² = 3vₑ² ⇒ v∞ = 11.2√3 km/s.
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