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# 52-kg block is held in place against the spring by a 70-N horizontal external force. The external force is removed, and the block is projected with a...

A 1.52-kg block is held in place against the spring by a 70-N horizontal external force. The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s upon separation from the spring. The block descends a ramp and has a velocity v2 = 1.9 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 is 0.34. The velocity of the block is v3 = 1.4 m/s at C. The block moves on to D, where it stops. In Fig. 7.4, the height of the ramp h, in cm, is closest to

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