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A force vecF=vecvxxvecA is exerted on a ...

A force `vecF=vecvxxvecA` is exerted on a particle in addition to the force of gravity, where `vecv` is the veocity of the particle and `vecA` is a constant vector in the horizontal direction. With what minimum speed a particle of mass m be projected so that it continues to move undeflected with a constant velocity?

A

`(mg)/(3A)`

B

`(mg)/(A)`

C

`(mg)/(2A)`

D

mg

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The correct Answer is:
b
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