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Best Answer: You're wrong about what the arctan function is. arctan is that function that answers the question, What angle theta yields the tan (theta) = x? arctan 0 = 0 because the tan 0 = sin 0 / cos 0 = 0/1 = 0.
You can work out the horizontal and vertical velocities at the time of impact - sketch them out head-to-tail and find the angle the resultant makes to the horizontal. Yes - it's the arctan. Simon Bridge, Sep 15, 2014