Question
a ball is dropped from the top of a building that is known to be 256 feet high.the formula for finding the height of the ball at any time t is h=256-16t^2,where t is measured in seconds.how many seconds will it take for the ball to hit the ground?
Answers
Steve
it hits the ground when the height is zero. So, just solve
256-16t^2 = 0
(16-4t)(16+4t) = 0
...
256-16t^2 = 0
(16-4t)(16+4t) = 0
...