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?

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PSDHE
PSDHE PSDHE
  • 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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