SOLUTION: a ball is thrown vertically upward with an initial velocity of 128 feet per second. The distance in feet of the ball from the ground after t seconds is s=128t-16t^2. For what inter
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Question 732700: a ball is thrown vertically upward with an initial velocity of 128 feet per second. The distance in feet of the ball from the ground after t seconds is s=128t-16t^2. For what interval of time is the ball more than 240 above the ground?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
There will be 2 solutions for
You must solve for for both solutions
and then find
Use quadratic formula
and
The interval of time the ball is more than 240 above the ground is 2 sec
Here's the plot:
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