A speedboat accelerates constantly from rest at 4.2 m/s? [N] for a displacement of 85.0 m [N]. Calculate the time for this acceleration? 7.8 s 6.4 S 61 161 sA ball is thrown straight up in the air at an initial velocity of 13.2 m/s [up]. How high does the ball go (from where it is thrown)? -2 m (up) . 8.9 m (up) 2.9 m (up) 73.5 m (up)