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A force exerts an impulse Ion a particle...

A force exerts an impulse Ion a particle changing its speed from initial velocity `u` to final velocity `2u`. The applied force and the initial velocity are oppositely oriented along the same line. The work done by the force is

A

`(3)/(2)` l u

B

`(1)/(2)` l u

C

l u

D

2 l u

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