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STD 11 - 9.1. fluid mechanics — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 9.1. fluid mechanics4 Marks
MCQ
An object falling through a fluid is observed to have acceleration given by $a = g -bv$ where $g =$ gravitational acceleration and $b$ is constant. After a long time of release, it is observed to fall with constant speed. The value of constant speed is
  • ✓
    $\frac{g}{b}$
  • B
    $\frac{b}{g}$
  • C
    $bg$
  • D
    $b$
✓

Answer

Correct option: A.
$\frac{g}{b}$
a
Here, $a=g-b v$

When an object falls with constant speed $v_{c},$ its

acceleration becomes zero.

$\mathrm{g}-\mathrm{bv}_{\mathrm{c}}=0 \text { or } \mathrm{v}_{\mathrm{c}}=\frac{\mathrm{g}}{\mathrm{b}}$

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