Where Does a Projectile Fired from a Cliff Land?

[stridle]

Homework Statement

A projectile is fired into the air from the top of a 200-m cliff above a valley. It's initial velocity is 60 m/s at 60 degrees above the horizontal. Where does the projectile land?

Homework Equations

delta x = intial velocity of x * t
delta y = -.5*g*t

The Attempt at a Solution

I solved for time and got 6.39s. When I put this back in for delta x I get 191.7m. However according to my professor the results should be .41km. Any ideas? Thanks!

 

[Jebus_Chris]

You have an initial speed in the y direction, 60sin60.

 

[stridle]

Thanks.