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# help ma doods

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Tom throws a ball into the air. The ball travels on a parabolic path represented by the equation h = -8t2 + 40t, where h represents the height of the ball above the ground and t represents the time in seconds. The maximum value achieved by the function is represented by the vertex. Use factoring to answer the following:

How many seconds does it take the ball to reach its highest point?

What ordered pair represents the highest point that the ball reaches as it travels through the air?

Hint: because parabolas are symmetric, the vertex of a parabola is halfway between the zeroes of the quadratic.

Feb 8, 2019

#1
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Using factoring

h = -8t^2 + 40 t

h =-8t (t-5)      t = 0   and  5        Max is at   (5-0)/2 = 2.5 sec    (midway between the zeroes)

at 2.5 sec

h = -8(2.5)^2 + 40 (2.5)

-50 +100= 50 ft                         orderd pair is  (2.5 sec , 50 ft)

Feb 8, 2019
edited by ElectricPavlov  Feb 8, 2019

#1
0

Using factoring

h = -8t^2 + 40 t

h =-8t (t-5)      t = 0   and  5        Max is at   (5-0)/2 = 2.5 sec    (midway between the zeroes)

at 2.5 sec

h = -8(2.5)^2 + 40 (2.5)

-50 +100= 50 ft                         orderd pair is  (2.5 sec , 50 ft)

ElectricPavlov Feb 8, 2019
edited by ElectricPavlov  Feb 8, 2019
#2
+1

thank you friend!

Bleh674  Feb 8, 2019