(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Classic cannon ball launched with an initial horizontal velocity from an elevated position.

Initial hvelocity: v

Final velocity (when hits the ground): 4v

High of the cliff: 16m

Find the initial velocity and the angle at which the ball strikes the ground.

2. Relevant equations

R=vt+1/2*a*t^{2}

finalv=v+a*t

3. The attempt at a solution

First, I find the vertical/horizontal info

initial horizontal velocity:v initial vertical velocity:0

horizontal acc:0 vertical acc:-9.82

horizontal velocity at instant t:v vertical velocity at instant t:gt

horizontal displ: v*t vertical displ:16??

I find t=√2s/a using the vertical info, but then I get stuck..

any hint please?

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# Homework Help: Horizontal cannon on a cliff

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