A 0.50 kg block is released from rest at a height of 1.8 m on a smooth curved ramp. At the bottom, the ramp joins a horizontal floor. The block first crosses a rough strip of the floor 2.0 m long, where the coefficient of kinetic friction is 0.20. After that the floor is smooth. On the smooth part, the block runs into a light horizontal spring of spring constant 400 N/m with its far end fixed. Take g = 10 m s⁻². What is the maximum compression of the spring?