Gravels are dropped on a conveyor belt at the rate of 0.5 kg/sec. The extra force required in newtons to keep the belt moving at 2 m /sec. is-

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Solution

The correct option is A 1
$\begin{matrix} A c c o r d i n g t o q u e s t i o n . . . . . . . . . . . H e r e, v i s c o n s t a n t a n d, \frac{d v}{d t} i s 0 s o, \frac{d m}{d t} = 0.5 k g / sec, v = 2 m / s H e n c e, e x t r a f o r c e r e q u i r e d = v \times \frac{d m}{d t} = 2 \times 0.5 = 1 N s o t h a t t h e c o r r e c t o p t i o n i s A . \end{matrix}$

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