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<h3>The option C) 15 s is correct</h3><h3>Therefore the maximum height it reaches in <u>15 seconds. </u></h3>Step-by-step explanation:
Given equation is
Given that a projectile is thrown upward so that its distance above the ground after t seconds is
"The standard form of a parabola's equation is expressed as :
.
If , then the parabola opens upwards;
if the parabola opens downwards."
The maximum height is the vertex of the parabola which is
.
Comparing the given equation with the standard form of parabola we get
the values of a=-13 , b=390 and c=0
The maximum height in .
Substitute the values we get