If a ball is given a push so that it has an initial velocity of 7 m/s down a certain inclined plane, then the distance it has rolled after t seconds is given by the following equation. s(t) = 7t + 2t2 (a) Find the velocity after 2 seconds. 15 m/s (6) How long does it take for the velocity to reach 35 m/s? (Round your answer to two decimal places.)