A projectile is launched from point A and lands on the same level at D. Its maximum alti...

A projectile is launched from point A and lands on the same level at D. Its maximum altitude is h. Determine and plot the fraction f₂ of the total flight time that the projectile is above the level f₁h, where f₁ is a fraction which can vary from zero to 1. State the value of f₂ for f₁ = ¾.