Carol serves the volleyball to Jennifer with an upward velocity of 13ft/s
. The ball is 4.5 feet above the ground when she strikes it. How long does Jennifer have to react, before the volleyball hits the ground? Round your answer to two decimal places.
if g = 9.81 m/s^2
h = Hi + Vi t - 4.9 t^2
h = 4.5 + 13 t -4.9 t^2
when is h = 0 ?
4.9 t^2 - 13 t - 4.5 = 0
t = [ - 4.9 +/- sqrt (169 - 88.2) ] / 9.81
for + t
t = [ -4.9 + 9 ]/2
= 0.4178