SOLUTION: For 1989 and 1990 Dave Johnson had the highest decathalon score in the world. When Johnson reached a speed of 32 ft/sec on the pole vault runway, his height above the ground t seco

Question 90608: For 1989 and 1990 Dave Johnson had the highest decathalon score in the world. When Johnson reached a speed of 32 ft/sec on the pole vault runway, his height above the ground t seconds after leaving the ground was given by h=-16t^2+32t. For how long was he more than 14 ft in the air?
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
14=-16t^2+32t ... 0=-16t^2+32t-14 ... 0=-8t^2+16t-7 ... ...

... he was more than 14 ft in the air between these two times

the difference is or approx .707 sec
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