Projectile Motion from a cliff with no information.

[stridle]

Homework Statement

The range of a cannonball fired horizontally from a cliff is equal to the height of the cliff. What is the direction of the velocity vector of the projectile as it strikes the ground? (ignore air resistance)

Homework Equations

I attempted setting delta y = delta x, but had not luck.

The Attempt at a Solution

The apparent solution is 63.4 degrees below the horizon.

 

[aim1732]

delta x= v[initial]*t and delta y=0.5*g*t*t as velocity is zero along y-axis initially.
What do you get when you equate the two?

 

[stridle]

I get inital velocity = .5*g*t. I found that solution earlier but I do not understand how they get an angle from that information?

 

[aim1732]

This velocity of yours is along which axis?

 

[stridle]

I honestly am very confused at this point.

 

[stridle]

I figured it out thanks for the help.