Question

If an object is projected vertically upward from ground level with an initial velocity of 320 ft/sec, then its distance s above the ground after t seconds is given by s=-16t^2+320t. For what values of t will the object be more than 1536 feet above the ground?

Answer 1

t>8 but less than 12

Answer 2

8<t<12 would be your answer buddy :)