Post-UTME Physics 2017 Objective — Question 7
Question 7 of 20 from the Post-UTME Screening (Post-UTME) Physics 2017 Objective paper, with the correct answer and a full explanation.
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A ball bearing is gently released from rest and allowed to fall through a viscous fluid. Which statement about its motion is correct?
- A. its acceleration decreases before terminal velocity is attained
- B. when terminal velocity is attained, acceleration becomes zeroCorrect
- C. its velocity increases before terminal velocity is attained
- D. there is no resultant force before terminal velocity
Explanation
As the ball accelerates, viscous drag increases until it balances weight; at that point acceleration becomes zero and velocity is constant (terminal velocity).
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