# Simple isn't it? #5

A stone is projected at an angle $$\theta$$ with the $$x$$-axis. The coefficient of friction on the $$x$$-axis is $$2$$. What is the value of $$\theta$$ for which the stone travels maximum distance along the $$\theta$$ before it comes to stop.

The answer is $${ x }^{ \circ }$$.

Find $$x$$.