An 080-Kg Block Is Held in Place Against the Spring by by a 67-N

question 5

Multiple Choice

An 0.80-kg block is held in place against the spring by a 67-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 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 over this section is 0.39.The velocity of the block is v₃ = 1.4 m/s at C.The block moves on to D,where it stops.The spring constant of the spring is closest to

• A)3900 N/m.
• B)2600 N/m.
• C)2000 N/m.
• D)1600 N/m.
• E)1100 N/m.

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