Problema Solution
h=-3.9t^2 + 11.2t+40 how long after the ball was thrown did it hit the ground
t represents seconds after the ball was thrown
Answer provided by our tutors
when the ball hits the ground the height h = 0 thus we need to solve the quadratic equation
-3.9t^2 + 11.2t+40 = 0
and find the positive roots
t = 4.95 sec
click here to see the step by step solution of the quadratic equation
after 4.95 seconds the ball will hit the ground.