A body of mass 36kg falls through a viscous liquid which offers a drag force…

A body of mass 36kg falls through a viscous liquid which offers a drag force of 260N on the body. The upthrust on the body at terminal velocity is?
[g = 10ms2]
  • A.
    100N
  • B.
    620N
  • C.
    50N
  • D.
    310N
Correct Answer: Option A
Explanation

For anybody falling through a viscous liquid, at its terminal velocity. the resultant force acting on its is zero. from the equation: Mg – v – u = 0. where v = viscous drag
U = upthrust Mg = weight of the body.
∴ 36 x 10 – 260 – U = 0
∴ U = 360 – 260 = 100N
Upthrust on the body = 100N.

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