As Shown in the Figure, a 1 $v_{1} = 1.2 \mathrm {~m} / \mathrm { s }$

question 210

Multiple Choice

As shown in the figure, a 1.45-kg block is held in place against the spring by a 21-N horizontal external force. The external force is removed, and the block is projected with a velocity $v_{1} = 1.2 \mathrm {~m} / \mathrm { s }$ as it separates from the spring. The block descends a ramp and has a velocity $v_{2} = 2.1 \mathrm {~m} / \mathrm { s }$ 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 between the block and the rough surface is 0.29. The velocity of the block is $v_{3} = 1.4 \mathrm {~m} / \mathrm { s }$ at C. The block moves on to D, where it stops. How much work is done by friction between points B and C?

• A) -1.8 J
• B) -3.6 J
• C) -14 J
• D) -6.4 J
• E) -7.0 J

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