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A 1.86-kg block is held in place against the spring by a 73-N horizontal external force...

A 1.86-kg block is held in place against the spring by a 73-N horizontal external force (see the figure). The external force is removed, and the block is projected with a velocity v 1 = 1.2 m/s upon separation from the spring. The block descends a ramp and has a velocity v 2= 1.7 m/s at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction over this section is 0.18. The velocity of the block is v 3 = 1.4 m/s at C. The block moves on to D, where it stops. The initial compression of the spring is closest to:

5.2 cm.
4.4 cm.
3.0 cm.
3.7 cm.
2.2 cm.
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