Cannon `A` is located on a plain a distance `L` from a wall of height `H`. On top of this wall is an idential cannon (cannon B). Ignore air resistance throughout this problem.
Also ignore the size of the cannons relative to `L and H`. The two groups of gunners aim the cannons directly at each other. They fire at each other simultaneously, with equal muzzle speed `v_0`
What is the velue of `v_0` for which the two cannon balls collide just as they hit the ground ?
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