阿摩線上測驗
57. An object travelling at constant speed vina circle of radius R has an acceleration a. If both R and v are doubled, the acceleration will change to
(A) a
(B) 2a
(C)4a
(D) 8a
(E) a/2
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統計： A(0), B(14), C(0), D(0), E(0) #3222824
統計： A(0), B(14), C(0), D(0), E(0) #3222824
