math problems

Question

The height h in feet of a ball after t seconds is given by h=64t-16t² 

How long did it take for the ball to hit the ground? 

Answer 1

h =64t-16t^2=0  to reach the ground (h=0)

 

16t(4-t)=0

t=0

t=4

 

So, it will take 4 seconds to reach the ground.