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Calculate the magnitude of the velocity of the rock just before it strikes the ground.

## Homework Equations

V=V_0 + at

X=V_0t + 1/2at^2

## The Attempt at a Solution

v_0(sin(alpha_0))-2(v_0)

The catch is that when i put the answer into the system, it told me that v_o and alpha_0 are not part of the answer. Any help is appreciated.