This is one of the questions at the mechanics finals that I skipped.(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

http://img155.imageshack.us/img155/1702/mecccs.jpg [Broken]

In the drawing is described the trajectory of a stone cast from a cliff at point A in an initial horizontal velocity V. During its motion the stone passes close to an obstacle at point B.

A) Calculate the minimal velocity V for the stone not to hit obstacle B

B) Calculate the velocity of the stone at point B (magnitude and direction

C) Calculate the horizontal distance from point A till it hits the ground

3. The attempt at a solution

From some reason I'm getting an error. I think the last formula I used should have an opposite Yi and Yf for it.

http://img683.imageshack.us/img683/2923/anattempt.jpg [Broken]

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# Horizontal projectile motion

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