The figure from below shows a block of mass $m$ and an incline. The frictional force is $20\,N$. Find the rotation speed in $\frac{m}{s}$ necessary such as the block begins to move upwards in the incline.

The alternatives given in my book are:

$\begin{array}{ll}

1.&\sqrt{5}\,\frac{m}{s}\\

2.&2\sqrt{5}\,\frac{m}{s}\\

3.&\frac{3\sqrt{5}}{5}\,\frac{m}{s}\\

4.&\sqrt{3}\,\frac{m}{s}\\

5.&2\sqrt{3}\,\frac{m}{s}\\

\end{array}$

I'm stuck with this problem as I don't know how to relate the frictional force such as the block slides up in the incline.

The only formula which comes to my mind in this kind of situation is this:

$v=\sqrt{Rg\tan\omega}$

Provided that masses cancel and a block is down in a incline. But I don't know how can I order the information to make it useful.

Can somebody help me here?. What can I do?. How to solve this problem?. :help: