Problema Solution
IF S=-16T^2+80T REPRESENTS THE HEIGHT OF A ROCKET, IN FEET, T SECONDS AFTER IT WAS FIRED, WHEN WILL THE ROCKET HIT THE GROUND? (HINT: THE ROCKET IS ON THE GROUND WHEN S=0)
Answer provided by our tutors
S=-16T^2+80T
the rocket if on the ground when S=0 and T is not 0 thus we need to solve the quadratic equation:
-16T^2+80T = 0
by solving we find:
T = 5 sec
click here to see the step by step solution of the equation:
the rocket will hit the ground after 5 seconds.