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**furor celtica** initially a small block of wood is at a point O on a rough plane inclined at 15° to the horizontal. the block is projected directly up the plane with initial speed 4ms^-1. The coefficient of friction between the block and the plane is 1/10. The block comes instantaneously to rest at A. Find the distance OA.

So I used v^2=u^2 + 2as to get s=8/a

then i used ma=µ(10mcos15) to get a but s turned up something like 8 and apparently thats wrong, can anyone show their working in this method?