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【多选题】
质点做直线运动的 v t 图象如图所示,则 ( )A.
在前 4 s 内质点做匀变速直线运动
B.
在 1 s ～ 3 s 内质点做匀变速直线运动
C.
3 s 末质点的速度大小为 5 m/s ，方向与规定的正方向相反
D.
2 s ～ 3 s 内与 3 s ～ 4 s 内质点的速度方向相反
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A.
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B.
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C.
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D.
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