if a football player passes a football from 4 ft. off the ground with an initial velocity of 36 ft. per sec. how long will it take the football to hit the ground? use the equation h=-16t^2+36t+4

Question

anonymous · Answer

the height of the ground is zero, I think.  So I would just sub in 0 for h then solve for t.  One of the answers might not make sense (i.e. negative time) so toss that one out.

anonymous · Answer

There is probably a simpler way than using the quadratic formula, but I'm lazy so...  I just plugged the numbers in:  a = -16   b = 36  c = 4    and got my 2 answers, one of them happened to be negative so I tossed it out, the other was (9+sqrt(97))/8  which I forced my calculator to approximate to 2.356 seconds.   That would be my answer.

anonymous · Answer

thankyou