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A particle is moving on the xy plane and its position at any time may be determined by the function r(t) = (5.80 m)i + [(2.30 m/s)i + (3.20 m/s)j]t - (6.40 m/s2)t2j. For this particle, determine the following at the time t = 4.23 s. (Express your answer in vector form.) (a) position vector r(t = 4.23 s) = m (b) velocity vector v (t = 4.23 s) = n/s (c) acceleration vector a(t = 4.23 s) = m/s2