SOLUTION: A projectile is launched from ground level with an initial velocity of 89 ft/sec. It's height(ft), t seconds after launching is given by s=-16t^2 + v0t + s0.
a) Fine the time(s) t
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Question 987862: A projectile is launched from ground level with an initial velocity of 89 ft/sec. It's height(ft), t seconds after launching is given by s=-16t^2 + v0t + s0.
a) Fine the time(s) the projectile will reach a height of 100 feet.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
\ =\ -16t^2\ +\ 89t)
Set the function equal to 100 and solve for 
. Since this is a quadratic equation, it will have two roots. If both roots are positive, then each is a time when the projectile is at an altitude of 100 feet; once on the way up, and once on the way down.
John
My calculator said it, I believe it, that settles it
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