Physics Force & Motion ETEA 2011
PMDC Verified Question 128 of 137
One ball is thrown vertically upward with a velocity of 98 m/s. If the takes 10 seconds to reach the highest point, then the acceleration of the ball is
A
\( 9.8 \text{ ms}^{-2} \)
B
\( 980 \text{ ms}^{-2} \)
C
\( 98 \text{ ms}^{-2} \)
D
\( -9.8 \text{ ms}^{-2} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: \( -9.8 \text{ ms}^{-2} \)
Concept:

Acceleration opposes upward velocity.

Solution:

  • $$ a = \frac{0 - 98}{10} = -9.8 \text{ m/s}^2 $$


Why other options are incorrect:

Missing the negative sign ignores the directional reality of gravity.

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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