A projectile of mass 0.491 kg is shot from a
cannon. The end of the cannon’s barrel is
at height 6.6 m, as shown in the figure. The
initial velocity of the projectile is 8.1 m/s.
The projectile rises to a maximum height of
∆y above the end of the cannon’s barrel and
strikes the ground a horizontal distance ∆x
past the end of the cannon’s barrel. How long does it take the projectile to hit the ground?