A 186-Kg Block Is Held in Place Against the Spring by by a 81-N

question 47

Multiple Choice

A 1.86-kg block is held in place against the spring by a 81-N horizontal external force (see the figure) .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 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 0.28.The velocity of the block is v₃ = 1.4 m/s at C.The block moves on to D,where it stops.The height h of the ramp is closest to

• A)11
• B)7.3
• C)15
• D)17
• E)18

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