A Box of Mass M Is Pressed Against (But Is

question 28

Multiple Choice

A box of mass m is pressed against (but is not attached to) an ideal spring of force constant k and negligible mass,compressing the spring a distance x.After it is released,the box slides up a frictionless incline as shown in the figure and eventually stops.If we repeat this experiment but instead use a spring having force constant 2k

• A) the box will go up the incline twice as high as before.
• B) just as it moves free of the spring, the kinetic energy of the box will be twice as great as before.
• C) just as it moves free of the spring, the speed of the box will be times as great as before.
• D) All of the above choices are correct.
• E) None of the above choices is correct.

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