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A 13 g projectile traveling 152 m/spenetrates into a 0.25-kg wad of putty and emerges cleanly at42 m/s.
(a) If the putty is stationary on a frictionlesssurface when hit, how fast does it move after the projectile emerges?
m/s
(b) How much kinetic energy was lost in this process?
J
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