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Question 5251
NEET Physics · Hard

Motion in a Straight Line: Mixed Motion Concepts MCQ

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Mixed Motion ConceptsHardQuestion 5251

Question

A stone is dropped into a well. The sound of splash is heard after 4 seconds. If speed of sound = 340 m/s and g = 10 m/s², the depth of the well is approximately:
  1. A
    75 m
    Correct
  2. B
    300 m
  3. C
    80 m
  4. D
    150 m

Correct answer

75 m

Explanation

d ≈ 75 m: t₁ = √(2×75/10) = √15 ≈ 3.87 s, t₂ = 75/340 ≈ 0.22 s. Total ≈ 4.09 s ≈ 4 s. Answer: 75 m.

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