Posted by **Anonymous** on Sunday, November 27, 2011 at 7:55pm.

a projectile is launched straight up with an initial velocity of 112 feet per second. how long would it take to reach 180 feet?

- physics -
**Henry**, Monday, November 28, 2011 at 8:21pm
d = Vo*t + 0.5g*t^2 = 180,

112t - 16t^2 - 180 = 0,

Divide both sides by 4:

28t - 4t^2 - 45 = 0,

-4t^2 + 28t - 45 = 0.

X = 2.5s. Use Quadratic Formula and use

the smaller of the 2 solutions.

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