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JEE Main 2026 (21 Jan, Shift 2) · Terminal Velocity

Terminal Velocity question from JEE Main 2026 (21 Jan, Shift 2)

Q2JEE Main 2026 · 21 JAN · SHIFT 2Easy

Terminal Velocity

The terminal velocity of a metallic ball of radius 6 mm in a viscous fluid is $20\text{ cm/s}$ . The terminal velocity of another ball of same material and having radius 3 mm in the same fluid will be $\underline{\hspace{3em}}\text{ cm/s}$ .

Numerical answer type. Work it out, then open the answer.

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Answer: 5

Terminal velocity $v \propto r^2$ for the same material and fluid.
$v_2 = 20\left(\frac{3}{6}\right)^2 = \frac{20}{4}$
$v_2 = 5$ cm/s

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