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15.如图,x轴在水平地面内,y轴沿竖直方向。图中画出了从y轴上沿x轴正向抛出的三个小球a、b和c的运动轨迹,其中b和c是从同一点抛出的,不计空气阻力,则 (A)a的飞行时间比b的长 (B)b和c的飞
問題詳情
15.如图,x轴在水平地面内,y轴沿竖直方向。图中画出了从y轴上沿x轴正向抛出的三个小球a、b和c的运动轨迹,其中b和c是从同一点抛出的,不计空气阻力,则
(A)a的飞行时间比b的长
(B)b和c的飞行时间相同
(C)a的水平速度比b的小
(D)b的初速度比c的大
參考答案
答案:B,D
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
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