An Ideal Spring with a Spring Constant of 3000 N/m

question 79

Multiple Choice

An ideal spring with a spring constant of 3000 N/m is attached at the bottom of a rough inclined plane that makes an angle of 37 degrees with the horizontal.The spring is compressed a distance of 80 cm and then a 12-kg box is placed on the spring.The coefficient of kinetic friction between the box and the inclined plane is 0.2.If the box is released from rest and is not attached to the spring,how fast will the box be traveling after sliding 4 m up the incline (3.2 m beyond the uncompressed length of the spring) ?

• A)6.9 m/s
• B)9.5 m/s
• C)11 m/s
• D)13 m/s
• E)14 m/s

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