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11.BD【解析】图甲中粒子做类平抛运动,水平位移和竖直位移大小相等,由=·E?得t=2mA项错误;图乙中粒子做匀速圆周运动,由几何关系知粒子在c点的速度方向竖直向下,B项正确;如果b、c两点重合,则粒子做类平抛运动的水平位移大小与图乙中粒子做匀速圆周运动的半径一定相等,则E有w·=9E=9B,可得B=2,C项错误;粒子从a点到b点所用时间为2m9E,粒子从a点到c点所用时间为1.2xm,又b、c两点重合时有B=20则图甲、乙中粒子运动时间的比值为2,D项正确。
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