SOLUTION: A ball is dropped from 144ft. above the ground. How long does it take to hit the ground?

Algebra ->  Expressions-with-variables -> SOLUTION: A ball is dropped from 144ft. above the ground. How long does it take to hit the ground?      Log On


   

Question 136669: A ball is dropped from 144ft. above the ground. How long does it take to hit the ground?
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
The formula for distance of a dropped ball at earth gravity is d+=+-16t%5E2 Or more generally d+=+-%28a%2F2%29t%5E2+%2B+v%5B0%5Dt+%2B+d%5B0%5D. In our case, v[0] and d[0] are both 0 and earth gravity is 32ft/sec^2
d+=+-16t%5E2
-144+=+-16+t%5E2
9+=+t%5E2
3+=+t