SOLUTION: if a projectile is shot vertically upward from the ground with an initial velocity of 150 ft per sec. Neglecting air resistance, its height S (in feet) above the ground t seconds a

Question 992225: if a projectile is shot vertically upward from the ground with an initial velocity of 150 ft per sec. Neglecting air resistance, its height S (in feet) above the ground t seconds after projection is given by S=-16t^2 + 150t
after how many seconds will it be 60ft above the ground?
Found 2 solutions by Alan3354, stanbon:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
duplicate.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
if a projectile is shot vertically upward from the ground with an initial velocity of 150 ft per sec. Neglecting air resistance, its height S (in feet) above the ground t seconds after projection is given by S=-16t^2 + 150t
after how many seconds will it be 60ft above the ground?
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S(t) = -16t^2 + 150t
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Solve:: -16t^2+150t = 60
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-8t^2 + 75t - 30 = 0
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t = 0.4187 or t = 8.956
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Cheers,
Stan H.
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