Physics Force & Motion ETEA 2014
PMDC Verified Question 126 of 137
A ball is dropped from the roof of a very tall building. What is its velocity after falling for 5.0s?
A
\( 1.96 \text{ ms}^{-1} \)
B
\( 9.80 \text{ ms}^{-1} \)
C
\( 49.0 \text{ ms}^{-1} \)
D
\( 98.0 \text{ ms}^{-1} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: \( 49.0 \text{ ms}^{-1} \)
Concept:

Velocity increases by \( g \) every second.

Solution:

  • $$ v = gt = 9.8 \times 5 = 49 \text{ m/s} $$


Why other options are incorrect:

9.8 is for 1s, 98 is for 10s.

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