SOLUTION: A student dropped a ball from the top of a 64 foot building. The height of the ball after t seconds is given by the quadratic equation h=-16t^2+64. How long will it take the ball

Algebra ->  Equations -> SOLUTION: A student dropped a ball from the top of a 64 foot building. The height of the ball after t seconds is given by the quadratic equation h=-16t^2+64. How long will it take the ball      Log On


   

Question 200254: A student dropped a ball from the top of a 64 foot building. The height of the ball after t seconds is given by the quadratic equation h=-16t^2+64. How long will it take the ball to hit the ground?
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
what is the height of the ball when i hits the ground?
zero.
So substitute in 0 and solve for t
h=-16t%5E2%2B64
0+=+16t%5E2%2B64
-64+=+-16t%5E2
4+=+t%5E2
2+=+t