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Question

# If the terminal speed of a sphere of material A (density = 9.5 kg/m3) is 4m/s in a viscous liquid (density = 6.5 kg/m3), find the terminal speed of a sphere of material B (density = 3.5 kg/m3) of the same size in the same liquid. (The ball of B is released from bottom in a very deep container)

A
6.4 m/s
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B
3 m/s
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C
8 m/s
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D
4 m/s
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Solution

## The correct option is D 4 m/s v=29r2n(ρsolid−ρfluid)g in both case difference is same when ρs>ρf→ we get Vterminal in downward direction. when ρs<ρf→ we get Vterminal in upward direction.

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