A box of mass m is pressed against (but is not attached to) an ideal spring of force constant k, compressing the spring a distance x. After it is released, the box slides up a frictionless incline as shown in Fig. 7.5 and eventually stops. If we repeat this experiment but instead use a spring having force constant 2k:
Just as it moves free of the spring, the speed of the box will be times as great as before.
Just as it moves free of the spring, the kinetic energy of the box will be twice as great as before.
The box will go up the incline twice as high as before.
All of the above choices are correct.
None of the above choices is correct.
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