Posted by Abdela said yimer on Saturday, January 28, 2012 at 7:11am.
With acceleration of 10 m/s^2,and initial velocity of 15 m/s, the displacement from initial position is
X = 15 t + 5 t^2
If X = 90,
5t^2 + 15t -90 = 0
t^2 + 3t -18 = 0
(t+6)(t-3) = 0
The positive solution is t = 3 seconds. Ignore the negative solution; it is outside the domain of the function.
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