A glider that is 180 kg is pushed by a spring with constant 3.2*10^5 N/m down a water slide track from a height of 35m in a zig zag path. Once the slide reaches the floor level track, it will be eventually stop due to friction. Friction only exists on the ground level, and the coefficient of kinetic friction here is 0.8. If 70 meters is the max distance that the glider move on this ground level track, what is the safest maximum distance that the spring can be compressed if a 20 kg person is also on the glider.

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