A rock is thrown from the roof of a building with a velocity v_0 at an angle of alpha_0 from the horizontal. The building has height h. You can ignore air resistance.(adsbygoogle = window.adsbygoogle || []).push({});

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

2. Relevant equations

V=V_0 + at

X=V_0t + 1/2at^2

3. 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.

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Rock thrown from roof

**Physics Forums | Science Articles, Homework Help, Discussion**