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A truck, carrying sand, moves with unifo...

A truck, carrying sand, moves with uniform velocity u on a smooth horizontal road. If `Delta`m mass of sand falls in time `Delta`t from the truck, then to maintain the speed u, the truck needs a force

A

`(Delta m u)/( Delta t)`

B

`(Delta m u)/( 2Delta t)`

C

`(Delta m u^(2))/( Delta t)`

D

zero

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