A projectile is thrown upward so that its distance above the ground after t seconds is h = -14t2 + 588t. After how many seconds does it reach its maximum height?
A) 21 sec
B) 42 sec
C) 28 sec
D) 14 sec

Question

Quizplus · Accepted Answer

The maximum height is reached at the vertex of the parabola represented by the equation h = -14t^2 + 588t. The time at which the maximum height is reached can be found using the formula t = -b/(2a), where a = -14 and b = 588. Plugging these values in gives t = -588 / (2 * -14) = 21 seconds.

A Projectile Is Thrown Upward So That Its Distance Above