If a stone is tossed from the top of a 270 meter building, the height of the stone as a function of time is given by h(t) = -9.8t2 – 10t + 270, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the nearest hundredth’s place; include units in your answer.

Question

anonymous · Answer

$$-9.8t^2-10t+270=0$$ since when it hits the ground, the height is 0

anonymous · Answer

use the quadratic formula to compute, it will be ugly i prefer to cheat http://www.wolframalpha.com/input/?i=-9.8t%5E2-10t%2B270%3D0