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A motorbike starts from the origin and m...

A motorbike starts from the origin and moves over an xy plane with acceleration components `a_(x)=6.0m//s^(2)anda_(y)=-3.0m//s^(2)`. The initial velocity of the motorbike has components `v_(0x)=12.0m//sandv_(0y)=18.0m//s`. Find the velocity of the motorbike, in unt-vector notation, when it reaches its greatest y coordinate.

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`(48m//s)hati`
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