SOLUTION: In 1981, Vladamir Poliakov (USSR) set a world record of 19ft 3/4 in for the pole vault. To reach that height, Poliakov obtained a speed of approximately 36 feet per second on the

Algebra ->  Pythagorean-theorem -> SOLUTION: In 1981, Vladamir Poliakov (USSR) set a world record of 19ft 3/4 in for the pole vault. To reach that height, Poliakov obtained a speed of approximately 36 feet per second on the       Log On


   

Question 350996: In 1981, Vladamir Poliakov (USSR) set a world record of 19ft 3/4 in for the pole vault. To reach that height, Poliakov obtained a speed of approximately 36 feet per second on the runway. The formula h=-16t2 + 36t gives his height t seconds after leaving the ground.
a. use the formula to find the exact values for t for which his height was 18 feet.

Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
Let h = 18 and solve for t.


h = -16t^2 + 36t


18 = -16t^2 + 36t


Bring everything to the left and set quadratic equation to zero.


16t^2 - 36t + 18 = 0


Use the quadratic formula to find your values for t.