A metal ball of weight W falls through a column of glycerine of viscosity V. If the ball experiences an upthrust U and terminal velocity is attained, then
-
A.
W > U + V -
B.
W = U + V -
C.
W = U – V -
D.
W
Correct Answer: Option B
Explanation
When terminal velocity is attained, The equation of motion becomes
mg – V – U = 0
(therefore) mg = W = U + V