4) The figure shows a block (mass unknown) that slides along a track that it frictionless until it slides through a region of friction (d = 6.00 m) on the last plateau, where the coefficient of friction is HK = 0.400. At the left, the block has height 5.00 m and speed 8.00 m/s. What is its speed (m/s) at the far right, after it emerges from the friction region? 8.00 m/s V = ? 5.00 m d 3 m 2.00 m - - - -- 1.0 m 1.5 m