Physics Force & Motion DUHS 2022
PMDC Verified Question 80 of 137
A body is dropped from certain height and falls freely. Its velocity after 5 seconds will be:
A
\( 0.49 \text{ m/s} \)
B
\( 9.4 \text{ m/s} \)
C
\( 4.9 \text{ m/s} \)
D
\( 49 \text{ m/s} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: \( 49 \text{ m/s} \)
Concept:

Free fall from rest causes velocity to increase linearly according to gravity.

Formula:

$$ v_f = v_i + gt $$

Solution:

  • Initial velocity \( v_i = 0 \).


  • Gravity \( g = 9.8 \text{ m/s}^2 \).


  • Time \( t = 5 \text{ s} \).


  • Substitute: $$ v_f = 0 + (9.8 \times 5) = 49 \text{ m/s} $$ (Option D).


Why other options are incorrect:

4.9 comes from dividing by 2 (confusing with distance formula). 9.4 is a typo for 9.8 (1 second of fall). The decimal point shifts in Options A, B, and C represent calculation errors.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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