Meriam, Kraige & Bolton — Kinematics of Particles: Problem 2_36

2/36 For the baseball of Prob. 2/35 thrown upward with an initial speed of 30 m/s, determine the time \(t_u\) from ground to apex and the time \(t_d\) from apex to ground. (From Prob 2/35: The \(y\)-acceleration moving upward is \(a_u = -g - kv^2\), while moving downward it is \(a_d = -g + kv^2\), where \(k = 0.006 \text{ m}^{-1}\), \(v_0 = 30 \text{ m/s}\), and assume \(g = 9.81 \text{ m/s}^2\).)