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A truck moving on a smooth horizotanal s...

A truck moving on a smooth horizotanal surface with a uniform speed u is carrying stonedust . If a mass `Delta m` of the stone-dust 'leaks' from the truck in a time` Delta t`, the force needed to keep the truck moving at its uniform speed is

A

`u ( Deltam )/( Delta t)`

B

`Delta m ( du )/( dt)`

C

`u ( Delta m)/(Delta t ) + ( Delta m ) ( du)/( dt)`

D

zero

Text Solution

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The correct Answer is:
A
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