During a softball game, a batter hits a ball upward from an initial height of 3 feet. The height, in feet, of the softball is given by s (t) = -16t^2 + 70t + 3, where t is time in seconds and t less than or equal to 0. Which is closest to the time when the softball will be 50 feet above the ground?

A. 0.66 sec
B. 5.03 sec
C. 0.83 sec or 3.55 sec
D. 0.66 sec or 5.03 sec

Will give fan and medal. Thank you in advance!

Question

During a softball game, a batter hits a ball upward from an initial height of 3 feet. The height, in feet, of the softball is given by s (t) = -16t^2 + 70t + 3, where t is time in seconds and t less than or equal to 0. Which is closest to the time when the softball will be 50 feet above the ground?

A. 0.66 sec
B. 5.03 sec
C. 0.83 sec or 3.55 sec
D. 0.66 sec or 5.03 sec

Will give fan and medal. Thank you in advance!

anonymous · Answer

use t = [70 +/- sqrt(70^2 - 4*16*47)] / 32 = (70 +/- 42.66) / 32

anonymous · Answer

so the answer is C

ray1998 · Answer

I'm sorry, I'm trying to understand the formula you gave me and apply it to the equation.

ray1998 · Answer

@timtasmania

anonymous · Answer

i don't know how else to explain it but was C the right answer?