As Shown in the Figure,a 1

question 1

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
As it separates from the spring.The block descends a ramp and has a velocity
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
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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