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The equation  describes the height (in feet) of a projectile launched from the ground at 60 feet per second upward. In how many seconds will the projectile first reach 56 feet in height? Express your answer as a decimal rounded to the nearest hundredth.

 Jun 10, 2021
 #1
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The equation (which was left out of the question) should be

-16t^2 + 60t      = h (t)

 

when will h(t) = 56 the firt time ( on the way upward for the projectile) ?

 

-16t^2 + 60 t = 56

-16t^2 + 60t -56 = 0      use quadratic formula to find   t = 1.75 seconds           and 2 seconds (on the way down)

 Jun 10, 2021

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