Physics Force & Motion UHS 2023
PMDC Verified Question 26 of 137
A man is in a car that is moving with the velocity of 36km/hr. His speed with respect to the car is:
A
10 m/s
B
36 m/s
C
Zero
D
Infinite
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Zero
Concept:

Relative velocity depends on the chosen frame of reference.

Solution:

  • The man is sitting inside the car. Therefore, both the man and the car share the exact same velocity vector relative to the ground.


  • To find his speed with respect to the car, we set the car as the stationary frame of reference.


  • Since he is not walking around inside the car, his position relative to the steering wheel doesn't change. Thus, his relative speed is zero.


Why other options are incorrect:

10 m/s (which is 36 km/h) would be his speed relative to a stationary observer on the sidewalk outside.

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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