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A football is kicked into the air from an initial height of 3 feet. the height, in feet, of the football above the ground is given by s(t)=-16t^2+35t+3. Where t is time in seconds and t>=0. which is closest to the time when the football will be 20ft above the ground?? A) 2.72 seconds B) 0.73 seconds or 1.46 seconds C) 0.53 seconds D) 0.53 seconds or 2.72 seconds

Jessie Thompson

in Mathematics

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1 answer

Jessie Thompson on February 15, 2018

For this case we have the following quadratic equation: Where, t: time: height of the ball By the time the height is 20 feet, we have: Rewrite the polynomial we have: the Use of the quadratic formula, we have: Substituting values we have: Do the calculations we need the roots are: Response: the time from when the football will be 20 feet above the ground is: (B) 0.73 seconds or 1.46 seconds

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