WAEC Physics 2016 Objective — Question 4
Question 4 of 50 from the West African Examinations Council (WAEC) Physics 2016 Objective paper, with the correct answer and a full explanation.
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4. A ball is dropped from the top of a tower. Due to air resistance, it reaches terminal velocity. Which of the following statement(s) about its motion is/are correct? I. The acceleration of the ball is zero II. The net force on the ball is zero III. The velocity of the ball increases A. I only B. I and II only C. II and III only D. I, II and III
- A. I only
- B. I and II onlyCorrect
- C. II and III only
- D. I, II and III
Explanation
At terminal velocity, acceleration is zero (statement I) and net force is zero (statement II), since the upward viscous drag and upthrust balance the weight, giving constant velocity.
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