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**Unformatted text preview: ** ^ ^ j 3.46: a) Integrating, r = (t - 3 t 3 )i + ( 2 t 2 ) ^ . Differentiating, a = (-2 )i + ^ . j b) The positive time at which x = 0 is given by t 2 = 3 . At this time, the y-coordinate is 3 3(2.4 m/s)(4.0 m/s 2 ) y = t2 = = = 9 .0 m 2 2 2(1.6 m/s3 ) . ...

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