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Kinetic Rock Toy

An object has a kinetic energy of 239 j and a momentum of magnitude 27.3 kgm/s. find the speed and the mass of the object. lets use the expressions of problem 1 k p mv2 2mv v 2 v 2k p 2 239 273 1751ms the mass cam be then obtained from momentum as m p v 273 1751 156kg 0.3 at one instant, a 17.0-kg sled is .

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