Question 410250
  <pre><font size = 3 color = "indigo"><b>
Hi
h(t) = -9.8t^2 – 10t + 210, where t is in seconds, and height is in meters
when it hits the ground: h(t) = 0
 -9.8t^2 – 10t + 210 = 0   |multiplying thru by -10
  98t + 100t - 2100 = 0
  49t^2 + 50t - 1050 = 0
{{{t = (-50 +- sqrt( 208300))/(98) }}}  |tossing out negative solution for time
  t = 4.15  (rounded to the nearest hundredth's place)