Physics Force & Motion DUHS 2023
PMDC Verified Question 46 of 137
A ball is thrown horizontally with 19.6 m/s. After 2 seconds its horizontal velocity component will be:
A
\( 4.9 \text{ m/s} \)
B
\( 9.8 \text{ m/s} \)
C
\( 19.6 \text{ m/s} \)
D
\( 39.2 \text{ m/s} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: \( 19.6 \text{ m/s} \)
Concept:

In projectile motion, there are strictly zero horizontal forces acting on the object (ignoring air resistance).

Solution:

  • According to Newton's First Law, horizontal acceleration is absolutely zero.


  • Because \( a_x = 0 \), the horizontal velocity \( v_x \) must remain perfectly constant throughout the entire flight.


  • If it starts at 19.6 m/s, it remains exactly 19.6 m/s after 2 seconds, or at any other time.


Why other options are incorrect:

The vertical velocity changes by 9.8 m/s every second, but this question specifically asks for the horizontal component, which never changes.

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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