Question 876037
t = .48sec and 
68.6 = -4.9t^2 + 144t
 -4.9t^2 + 144t - 68.6 = 0
t = .48 and t = 28.90 
from t = .48sec to 28.90sec
 *[invoke quadratic "x", -4.9,144,-68.6]