Posted by Mariah on Friday, January 31, 2014 at 6:12pm.
8.6 = 4.9 t^2 t = 1.32 seconds to fall 8.6 meters v = g t = 9.81*1.32 = 13 m/s so speed = sqrt (169 + 1.3*2) =sqrt(169+1.69) =13.06 m/s