**Unformatted text preview: **d = 0.292 m being the only positive root. (b) We apply equation 8-31 again and relate U r to the "second" kinetic energy K s it has at the unstretched position. K r + U r = f k d + K s + U s ¡ 1 2 kd 2 = f k d + K s + 0 Using the result from part (a), this yields K s = 14.2 J....

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