andreaelizabeth951
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A soccer ball is kicked from the ground with an initial upward velocity of 90 feet per second. The equation h = -16t² +90t gives the height h of the ball after t seconds.
a Explain what the a, b, &c mean in this problem.
b. How many seconds will it take for the ball to reach the ground?​

Respuesta :

Answer:

See below

Step-by-step explanation:

a = -16    =   - 1/2 a    where a is acceleration of gravity (32 ft/s^2)

b = 90    = initial velocity     90 ft/s

c = 0      = initial height = 0 ft ( kicked from off of the ground )

Height = 0   when the ball hit the ground

             0 = -16t^2 + 90t

               0 = -t ( 16t-90)       t = 0     or  90/16 = 5.63 seconds