問題詳情

21. The diagram represents a mass on a spring scale in an elevator. If the reading on the spring scaleis 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

參考答案

答案：D
難度：非常困難0
統計：A(1),B(0),C(0),D(0),E(0)