Home Physics Newton's Laws of Motion Second Law of Motion If in a stationary lift, a man is standing w…
Physics Newton's Laws of Motion Second Law of Motion Single Correct MCQ
Published on: September 12, 2026

If in a stationary lift, a man is standing with a bucket full of water, having a hole at its bottom. The rate of flow of water through this hole is R_0 . If the lift starts to move up and down with same acceleration and then that rates of flow of water are R_u and \(\mathrm{R}_{d}\) , then

A
R_0 > R_u > R_d
B
R_u > R_0 > R_d
C
R_d > R_0 > R_u
D
R_u > R_d > R_0

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The correct answer is:
B

Rate of flow will be more when elevator will move in upward direction with some acceleration because the net downward pull will be more and vice-versa.

\(F_{\text{upward}}(R_u) = m(g - a) \\ F_{\text{downward}}(R_d) = m(g + a) \Rightarrow F_{\text{at rest}}(R_0) = mg\)

Thus, relation between \(R_u \cdot R_o\) and R_d is R_u > R_o > R_d

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