Multiple Choice Question 13A box of massm 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 thefigure and eventually stops. If we repeat this experimentbut instead use a spring having force constant 2kSmoothTTTSmoothO tne block will go up the incline to half as high as before.O just as it moves free of the spring, the kinetic energy of thebox will be twice as great as before.O the box will go up the incline twice as high as before.O none of the choicesO just as it moves free of the spring, the speed of the box willbe two times as great as before. Question 5When you throw a pebble straight up with initial speed V,it reaches a maximum height H with no air resistance. Atwhat speed should you throw it up vertically so it will gotwice as high?None of the given choicesO 2VO 8VO 4V

The correct option, Given, spring constant=kcompression of the spring=xmass of the box=m

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 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