When a ruler falls vertically, 5 different persons catch it with… | NEET 2026

Q1NEET 2026Easy

Motion Under Gravity

When a ruler falls vertically, 5 different persons catch it with different reaction times. ( $g = 9.8\text{ m s}^{-2}$ )

A. Person A has reaction time of 0.20 s.

B. Person $B$ has reaction time of 0.22 s.

C. Person C has reaction time of 0.18 s.

D. Person D has reaction time of 0.19 s.

E. Person E has reaction time of 0.21 s.

What is the correct order of the distance travelled by the ruler for each person?

Show answer and solution

Answer: (c)

The ruler falls freely during the reaction time: $d = \frac{1}{2}gt^2$ , so $d \propto t^2$ .
Longer reaction time means longer fall: $t_B (0.22) > t_E (0.21) > t_A (0.20) > t_D (0.19) > t_C (0.18)$ .
Order: B > E > A > D > C
So the answer is (c).

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