How do I solve this...A block of mass m is projected across a horizontal surface with an initial speed v?

How do I solve this...A block of mass m is projected across a horizontal surface with an initial speed v?
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It slides until it stops due to the friction force between the block and the surface. The same block is now projected across the horizontal surface with an initial speed v/2. When the block has come to rest, how does the distance from the projection point compare to that in the first case?
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