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The velocity v of a particle moving in the xy plane is given by v = (5.0t -4.0t^2 )i + 4.5j, in m/s. Here v is in m/s and t (for positive time) is in s. What is the acceleration when t = 3.0 s I-component of acceleration and J-component of acceleration? When (if ever) is the acceleration zero (enter time in s or 'never')?

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