A 012-Kg Block Is Held in Place Against the Spring by by a 35-N

question 131

Multiple Choice

A 0.12-kg block is held in place against the spring by a 35-N horizontal external force. The external
force is removed, and the block is projected with a velocity $v _ { 1 } = 1.2 \mathrm {~m} / \mathrm { s }$ when it separates from the spring, as shown in the figure. The block descends a ramp and has a velocity $v _ { 2 } = 1.4 \mathrm {~m} / \mathrm { s }$ bottom of the ramp. 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 between the block and the rough surface is 0.26 . The block moves on to D, where it stops. By how many centimeters was the spring initially compressed?

• A) 0.26 cm
• B) 0.99 cm
• C) 0.18 cm
• D) 0.49 cm
• E) 0.67 cm

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