一质点在Oxy平面上运动,运动方程为r=3ti+t²j(SI),则在t=2s时质点的速率及加速度大小分别为
A.7m/s,2m/s²
B.7m/s,5m/s²
C.5m/s,2m/s²
D.5m/s,5m/s²
正确答案是C
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