Question 622025
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
by h(t)= -9.8t^2 - 10t + 250, where t is in seconds, and height is in meters. 
Hits the ground, then h =0
  -9.8t^2 - 10t + 250 = 0
{{{t = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{t = (10 +- sqrt( 9900))/(-19.6) }}} 
throwing out negative solution for time
 t = 4.566sec