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PHYSICS

JAMB 2019 - Question 33

Physics 2019 JAMB Past Questions - Question 33: A body of mass 36kg 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

Choose the correct answers from the options given.

A body of mass 36kg 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

A: 310N

B: 50N

C: 620N

D: 100N

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Correct Answer

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.