SOLUTION: A ball is thrown straight upin the air from a height of 6 feet at a speed of 80 feet per second. The height of the ball in feet is given by -16t^2 + 80t + 6 where t is the time in

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: A ball is thrown straight upin the air from a height of 6 feet at a speed of 80 feet per second. The height of the ball in feet is given by -16t^2 + 80t + 6 where t is the time in       Log On


   



Question 545578: A ball is thrown straight upin the air from a height of 6 feet at a speed of 80 feet per second. The height of the ball in feet is given by -16t^2 + 80t + 6 where t is the time in seconds. What is the height of the ball after 3 seconds
Answer by jerryguo41(197) About Me  (Show Source):
You can put this solution on YOUR website!
-16t%5E2%2B80t%2B6
1) Basic physics formula for anything that has initial velocity is
-16%28t%29%5E2%2Bvt%2Bh t= number of seconds; x= inital velocity (i.e. how hard was it thrown); h= initial height
2)Plug three in where you see a "t"
-16%283%29%5E2%2B80%283%29%2B6
3) Square then multiply
-16%289%29%2B80%283%29%2B6
-144%2B240%2B6
4) Simplify
102
5) At three seconds the ball is 102ft off the ground