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

Algebra ->  Length-and-distance -> 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      Log On


   

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) About Me  (Show Source):
Answer by stanbon(75887) About Me  (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?
-----
S(t) = -16t^2 + 150t
----
Solve:: -16t^2+150t = 60
----------
-8t^2 + 75t - 30 = 0
-----
t = 0.4187 or t = 8.956
------
Cheers,
Stan H.