A projectile is launched horizontally with a speed of 80.0 m/s. If the projectile is launched 1.5m above the floor, how long does it take the projectile to hit the floor?

Answer 1

The horizontal launching speed has zero vertical component. The time to hit the ground will be the same as if it were simply dropped.

1.5 m = (1/2) g t^2

Solve for t