Cyrkody Cyrkody

23-01-2019
Mathematics

contestada

-16t^2+64t+160
after how many seconds is the ball 100 feet off the ground's surface?

Respuesta :

25-01-2019

The ball is 100 feet of the ground’s surface, that mean -16t^2 + 64t + 160 = 100
<=> -16t^2 + 64t + 60= 0
<=> t= 4.78s ; t = -0.78s (reject)

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