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A body of mass m(0) is placed on a smoot...

A body of mass `m_(0)` is placed on a smooth horizontal surface . The mass of the body is decreasing exponentially with disintegration constant , `lambda` . Assuming that the mass is ejected backwards with a relative velocity u . If initially the body was at rest , the speed of body at time t is

A

`ue^(lambda t)`

B

`u lambda t`

C

`ue ^(-lambda t)`

D

`u ( 1 - e^(-lambda t))`

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