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A wagon fully loaded with sand moue on p...

A wagon fully loaded with sand moue on parallel rails with constant speed v, Now, bottom door of wagon s partially opened and sand starts falling at the rate m kg per second. Find ext. force req. (if any) to keep pull of wagon constant as function of time?

A

0

B

`(Ft)/(M_(0)+mut)`

C

`(2Ft)/(M_(0)+mut)`

D

None of these

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The correct Answer is:
A
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