Question

A small steel ball falls through a syrup with a speed of $10cm{s}^{-1}$. If the steel ball is given an upward force equal to its effective weight, it would move upward with a speed of

• A. $10cm{s}^{-1}$
• B. $20cm{s}^{-1}$
• C. $5cm{s}^{-1}$
• D. $10\sqrt{3}cm{s}^{-1}$

Answer 1

The correct option is D $10\sqrt{3}cm{s}^{-1}$

Now,

$v\left(\delta -d\right)g=fv$

Option $A$ is correct answer.