Question

A projectile if fired straight upward with an initial velocity of 400 feet per second is modeled by the equation h(t) = - 16t^2 + 400t. How long does it take the projectile to reach the maximum height?


6.25 seconds


2500 seconds


12.5 seconds


25 seconds

Answer 1

\[h(t) = - 16t^2 + 400t\] max at
\[-\frac{b}{2a}=-\frac{400}{2\times (-16)}\]

Answer 2

I got A..

Answer 3

nope

Answer 4

\(400\div 32=12.5\)

Answer 5

Ughhhh....