# SOLUTION: If an object is given an initial velocity of v0 feet per second from a height of S0 feet, then its height S after t seconds is given by the formula S= -16t SQRD+vt+S . A rock is t

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 Question 118874: If an object is given an initial velocity of v0 feet per second from a height of S0 feet, then its height S after t seconds is given by the formula S= -16t SQRD+vt+S . A rock is thrown into the air at 26 feet per second from a height of 13 feet. How long does it take to reach the earth?Answer by ankor@dixie-net.com(15656)   (Show Source): You can put this solution on YOUR website!If an object is given an initial velocity of v0 feet per second from a height of S0 feet, then its height S after t seconds is given by the formula S= -16t SQRD+vt+S . A rock is thrown into the air at 26 feet per second from a height of 13 feet. How long does it take to reach the earth? : We can write it, the ground would be 0 ft; : -16t^2 + 26t + 13 = 0 : Use the quadratic formula to solve this equation: a=-16; b=26; c=13 : : Do the math here. you should get a positive solution of t = 2.026 sec to reach the ground : Check your solution in the original equation