http://session masteringphysics.com/myct/itemvu p 2C Mastering Physics Self-Asse

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http://session masteringphysics.com/myct/itemvu p 2C Mastering Physics Self-Asse x MP search o help protect your security, your web browser has blocked this website x D a Safety signed in as Aama Time Remaining: 00:29:26 Hde A box of mass m is pressed against but is not attached to) anideal spring constam k and negigtlemass compressing the springadstance z the box sides up a fisonlessindine as thewn After Ris released elforce in the sgure and eventualy stops ltwe repeat tis experiment but instead use a spring having force constant 2k Smooth O just as moves free of the spring the speed of the box wi be v2smes as geat as betore just as it moves free of the spring the energy of the box wil be twice as great as before kinetic 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 conrect

Explanation / Answer

and all of the choices are correct :

a) PE stored in spring = .5k*x^2 , so increasing k to 2k will change the potential energy by 2

and using energy conservation PE = KE of block hence KE becomes double = mgh

so height also becomes dobule

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