Question 1199211
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<pre>

To find time "t", you need solve this quadratic equation

    -4.9t^2 + 19.6t = 14.7  meters.


Simplify it step by step

    -4.9t^2 + 19.6t - 14.7 = 0


Divide by (-4.9) both sides

    t^2 - 4t + 3 = 0


Factor left side

    (t-3)*(t-1) = 0.


There are two positive roots  t= 1 second and  t= 3 seconds.


First root is for the ball moving vertically up; the second root is for the ball falling down.
</pre>

Solved, with complete explanations.


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