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21. The diagram represents a mass on a spring scale in an elevator. If the reading on the spring scale is 0.75 of the value when at rest, what is the acceleration of the elevator? (In units of g.) 

(A) 1.25 up
(B) 0.75 up
(C) 0.25 up
(D) 0.25 down




21. The diagram represents a mass on a s..-阿摩線上測驗