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A motor boat of mass m moves along a lak...

A motor boat of mass `m` moves along a lake with velocity `V_(0)`. At the moment `t=0` the engine of the boat is shut down. Assuming the resistance of water is proportional to the velocity of the boat `vecF=-rvecv`
Q. How long the motor boat with the shut down engine.

A

`(2r)/(v_(0))`

B

`(r)/(v_(0))`

C

`(r)/(2v_(0))`

D

`infty`

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