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JAMB Physics 2005 Question 49

Question 49

Friction

A body of mass 36 kg falls through a viscous liquid which offers a drag force of 260 N on the body. The upthrust on the body at terminal velocity is [g = 10ms−2]

  1. A.310 N.
  2. B.50 N.
  3. C.620 N.
  4. D.100 N.
Show the answer and explanation

Answer: D (100 N.)

Explanation

At terminal velocity weight = drag + upthrust: 360 = 260 + U, so U = 100 N.