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The block is projected directly up the plane with initial speed 4m/s.

The coefficient of friction between the block and the plane is 1/10.

The block comes instantaneously at rest at A.

i) Find the distance OA

ii) Find the speed of the block as it passed through O when moving back down the plane.

I would really appreciate it if someone could help me with this question as I've spent around half an hour trying to figure it out.

Many thanks.