How much should a spring of indefinite length be compressed to have a – McqOptions

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1.	How much should a spring of indefinite length be compressed to have a potential energy equivalent to a ball of mass 6 kg raised to a height of 120 m above the ground? Let the spring have a stiffness of k = 100 N/m and assume g = 10 m/s2.
A.	6m
B.	12m
C.	20m
D.	144m
Answer» C. 20m

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