SOLUTION: according to the national association of rocketry the current model rocket altitude record in the f altitude events for ages 14 through 18 division is 1430 meters. from this record

Question 1103806: according to the national association of rocketry the current model rocket altitude record in the f altitude events for ages 14 through 18 division is 1430 meters. from this record-setting altitude, the rocket is motionless as it begins his free fall the sat back to the ground using the equations, h (t)=-4.9t^2+v^0t+h^0find how long it will take here for the rocket to hit the ground after reaching its high point. (Hint: motionless implies and hitting the ground implies)
Answer by ikleyn(52780) (Show Source): You can put this solution on YOUR website!
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It to omit all the literature, or, better to say, if translate this literature to Math or Physics, it means the following:



    How long it will take for freely falling body to hit the ground from the height of 1430 meters.



Using the equation h(t) = -4.9*t^2 + 0*t + 1430  (where "0" means the zero initial velocity, or motionless condition at the highest point 
of the trajectory),

getting ground level means h(t) = 0,  so you need to solve this quadratic equation


-4.9*t^2 + 0*t + 1430 = 0,   or


4.9*t^2 = 1430  ====>  t^2 =  = 291.9  ====>  t =  = 17.1 seconds (approximately).


Answer.  17.1 seconds (approximately).

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