When a ruler falls vertically, 5 different persons catch it with different reaction times. (g=9.8 m s⁻²)$\left(\mathrm{g}=9.8\ \mathrm{m}\ \mathrm{s}^{-2}\right)$
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?
A.C > D > A > B > E
B.C > D > A > E > B
C.B > E > A > C > D
D.B > E > A > D > C
Solution & Explanation
Related Formula
S = (1)/(2)g t²$$S = \frac{1}{2}g t^2$$
Core Logic
Distance S ∝ t²$S \propto t^2$.
Larger reaction time leads to greater distance fallen.
Reaction times in descending order: tB (0.22s) > tE (0.21s) > tA (0.20s) > tD (0.19s) > tC (0.18s)$t_B (0.22\text{s}) > t_E (0.21\text{s}) > t_A (0.20\text{s}) > t_D (0.19\text{s}) > t_C (0.18\text{s})$.
Therefore, distances in descending order: SB > SE > SA > SD > SC$S_B > S_E > S_A > S_D > S_C$.
Pattern Recognition
Free fall distance increases monotonically with reaction time.
Keywords:#ruler reaction time distance travelled order#NEET 2026 Code 12 Q30#Motion in a Straight Line NEET 2026#Reaction Time and Distance NEET 2026
More Motion in a Straight Line Previous-Year Questions
Q5neet_2024_05_may_morningVelocity-Time Graphs
The following plots show variation of velocity (v) with time (t), of a ball thrown vertically upward, and falling back. Which of the following plots is/are correct?
A.
Plots showing various candidates for velocity vs time curves of a projectile.
B.
Plots showing various candidates for velocity vs time curves of a projectile.
C.
Plots showing various candidates for velocity vs time curves of a projectile.
D.
Plots showing various candidates for velocity vs time curves of a projectile.
E.
Plots showing various candidates for velocity vs time curves of a projectile.
A. C only
B. A and E only
C. D only
D. B only
Solution
Related Formula
a = (dv)/(dt) = -g$$a = \frac{dv}{dt} = -g$$
Core Logic
Throughout the motion, acceleration due to gravity acts downward (a = -g$a = -g$).
Therefore, the slope of the velocity vs time curve must be constant and negative throughout.
Plots showing various candidates for velocity vs time curves of a projectile.
Hence, curve (C) is correct.
Pattern Recognition
Constant downward acceleration requires a straight line with a negative slope on a v-t graph.
Chapter Mix
Class 11 Physics: Motion in a Straight Line
More Motion in a Straight Line Questions — neet_2024_05_may_morning
Practice past-year questions one chapter at a time. Pick an exam → subject → chapter and get every PYQ for that topic — pulled together from all past papers — with the chapter's key formulas alongside.
