Consider a marble moving on a horizontal track with a speed of 10 meters per second( ignore friction and air resistance). the marble leaves the track and falls through the air to the ground a vertical distance of 1.5 meters.

how long does it take to for the marble to hit the ground?

d = Vo*t + 0.5g*t^2 = 1.5 m.

0 + 4.9*t^2 = 1,5,
t^2 = 0.306,
t = 0.553 s.