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Q1) TWO blocks with the same weight are released simultaneously from rest on a plane inclined 25^o above the horizontal. There is a linear displacement of 30 m in the direction of the slope between the upper block and the lower block when they are released from rest.

The coefficient of friction between the upper block and the plane is 0.15, whilst the coefficient of friction between the lower block and the plane is 0.25.

Calculate the time taken for the upper block to close the 30 m displacement between blocks. (16)