A rubber band has mass m=0.30 g  and a spring constant k=15 N.m−1 . I stretch it by 5.0 cm  (which in this case doubles its length). Assume the rubber band behaves as a Hooke's law spring. Assume that, when you launch the rubber band, all of the stored potential energy is converted into kinetic energy. How fast is it at the launch? v= _____  m.s−1 .

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