A punter kicks a football upward with an initial speed of 48 feet per second. After how many seconds does the ball hit the ground? Use the formula h = rt - 16t2 where h represents height in feet and r represents the initial speed.

Question

btaylor · Answer

so you want to solve for t here:
0 = 48t -16t^2
you can take out a gcf of 16t:
16t(3-t)=0
so h = 0 at t=0 and t = 3.

anonymous · Answer

so the answer is 0?

btaylor · Answer

well, I'd put 3 as my answer, because it is pretty obvious that it is on the ground at t=0.