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AIIMS 201925 May
Exam
AIIMS
Year
2019
Date
25 May
Subject
Physics
Chapter
Motion in One Dimension

AIIMS 2019 · 25 May · Physics · Motion in One Dimension

A body released from a great height falls freely towards the earth....

A body released from a great height falls freely towards the earth. Another body is released from the same height exactly a second later. Then the separation between two bodies, 2 s2 \mathrm{~s} after the release of the second body is nearly

Options

  1. A15 m15 \mathrm{~m}
  2. B20 m20 \mathrm{~m}
  3. C25 m25 \mathrm{~m}
  4. D30 m30 \mathrm{~m}

Correct answer

C. 25 m25 \mathrm{~m}

Step-by-step solution

Let the first body fall through a height h1h_1 during 3 s∴h1=12g(3)2=92g3 \mathrm{~s} \therefore \quad h_1=\frac{1}{2} g(3)^2=\frac{9}{2} g and the second body falls through a height h2h_2 during 2 s2 \mathrm{~s}h2=12g(2)2=42g∴h1−h2=92g−42g=52g=25 m\begin{aligned} & h_2=\frac{1}{2} g(2)^2=\frac{4}{2} g \quad \therefore h_1-h_2 \\ & =\frac{9}{2} g-\frac{4}{2} g=\frac{5}{2} g=25 \mathrm{~m}\end{aligned}$$
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