Question 1071607
5.  After 6.5 seconds, h(6.5)=-4.9(6.5^2)+1000=-207.025+1000=793 meters to nearest meter.
6.  100=-4.9 x^2+1000
-900=-4.9 x^2
x^2=183.67
x=13.55 sec.
7.  Assuming that there is no change in speed, no deceleration, 
0=-4.9x^2+1000
4.9x^2=1000
x^2=204.08
x=14.29 sec