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## Homework Statement

A projectile is fired at an upward angle of 45 degrees from the top of a 165m Cliff with a speed of 175 m/s. what will be its speed when it strikes the ground below? (Use conservation of energy and neglect air resistance.)

## Homework Equations

E= Ke +Pe

1/2 mv^2 + mgh = 1/2mv^2 +mgh

v^2= Vo^2 +2a(xo-x)

??

## The Attempt at a Solution

I honestly don't know where to start, or if I have the right equations? A point in the right direction would be appreciated.