1.The graph shows acceleration versus time for three different objects, α, β, and γ, all of which start at rest from the same position. Which object is going fastest at the time t1? 
(A) object α
(B) object β
(C) object γ
(D) objects α and γ
(E) objects α, β, and γ
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統計: A(4), B(1), C(0), D(1), E(0) #3427001
統計: A(4), B(1), C(0), D(1), E(0) #3427001