If a ball is given a push so that it has an initial velocity of 3 m/s down a certain inclined plane, then the distance it has rolled after t seconds is given by th s(t) = 3t + 3t2 (a) Find the velocity (in m/s) after 2 seconds. m/s (b) How long (in seconds) does it take for the velocity to reach 45 m/s? (Round your answer to two decimal places.)

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