JAMB Physics 2015 Objective — Question 41

Question 41 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2015 Objective paper, with the correct answer and a full explanation.

From the diagram, at terminal velocity, the three forces are related by the expression

• A. v + u = mg
• B. mg + v − u = 0Correct
• C. v − u = mg
• D. mg + v = u

Explanation

At terminal velocity the net force is zero: the upthrust (U) plus viscous force (V) balance the weight (mg), giving mg + v − u = 0 in the labelling shown.

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