A flare is fired straight up from the ground with an initial velocity of 100 feet per second. How long will it take for the flair to reach an altitude of 175 feet?

Question

whpalmer4 · Answer

$$h(t) = -\frac{1}{2}gt^2 + v_0 t + h_0$$
You've got $g = 32\text{ ft/s}^2$, $v_0 = 100 \text{ ft/s}$, $h_0 = 0 \text{ ft}$

Set $h(t) = 175\text{ ft}$ and solve for the value of $t$.

whpalmer4 · Answer

Are you sure you've copied the problem correctly?  Have you seen the equation I gave you before?  I'm wondering if perhaps you aren't expected to account for gravitational acceleration.

anonymous · Answer

That's what I was thinking, too! Alright, thanks for trying...I'm going to sleep. Good night...thanks again!