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The equation y = -16t^2 + 80t describes the height (in feet) of a projectile launched from the ground at 80 feet per second. At what will the projectile reach 80 feet in height for the first time? Express your answer as a decimal rounded to the nearest tenth.

 May 27, 2021
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y = -16t^2 +80t

 

80 = -16 t^2 + 80t

-16t^2 +80t - 80 = 0       quadratic formula shows t = ~1.4 SECONDS

 May 27, 2021

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