I cant seem to know where to start on this question:

How do I try to start this please? I am thinking we may need to find the resistive force F and then use this to try and find a mass? And then use SUVAT to work out the time?A block is thrown down a slope inclined at 35 degrees to the horiztonal. It's initial velocity is $\displaystyle 8ms^1$ and the coefficient of friction between the block and the slope is 0.8.

How long does it tale for the block to come to rest?

I am completely clueless it has to be said, and it would be amazing is anyone could possibly gie me some helpful pointers on where to go with this question?

many thanks, I will + rep you