Ask Question
2 October, 17:24

A projectile is fired straight up from ground level. After t seconds it's height is above the ground is h feet where h=-16t^2+144t. For what time period is the projectile at least 288 ft off the ground?

+5
Answers (1)
  1. 2 October, 20:41
    0
    Plug in 288 for h, move it over to the right side and do the quadratic formula to solve for t. You will get 2 times, in between and including those times will give you the period it is at least 288 ft off the ground.

    You can simplify this and not need to use the quadratic. 288=-16 t^2 + 144t

    Divide through by 16 getting

    18=-t^2 + 9t

    t^2 - 9t+18=0 Is what you would get after rearranging the equation Now you have something you can easily factor
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “A projectile is fired straight up from ground level. After t seconds it's height is above the ground is h feet where h=-16t^2+144t. For ...” in 📘 Physics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers