The position of a softball tossed vertically
upward is described by the equation
y = c_1 t − c_2t^2
where y is in meters, t in seconds, c_1 =
7.13 m/s, and c2 = 4.49 m/s^2
Find the ball’s initial speed v_0 at t_0 = 0 s.
Answer in units of m/s.