Q109 / 199 · NEET 2008 (Mains) · Physics

Sand is being dropped on a conveyor belt at the rate of $\mathrm{M} \mathrm{kg} / \mathrm{s}$. The force necessary to keep the belt moving with a constant velocity of $v \mathrm{~m} / \mathrm{s}$ will be

A
Zero
Correct answer
B
$\mathrm{M} v$ newton
C
$2 \mathrm{M} v$ newton
D
$\frac{M v}{2}$ newton

Solution

Force $=v \frac{d u}{d t}=M v$

Hence, the correct answer is option: 'B'.

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