某质点沿x轴运动,它的位置坐标x与时间t的关系为x=2t2-3t,由此可知t=2s时它的速度和加速度的大小分别为A.-3m/s,4m/s2 B.2m/s,2m/s2C.-1m/s,2m/s2 D.1m/s,4m/s2题没抄错
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![某质点沿x轴运动,它的位置坐标x与时间t的关系为x=2t2-3t,由此可知t=2s时它的速度和加速度的大小分别为A.-3m/s,4m/s2 B.2m/s,2m/s2C.-1m/s,2m/s2 D.1m/s,4m/s2题没抄错](/uploads/image/z/3035760-24-0.jpg?t=%E6%9F%90%E8%B4%A8%E7%82%B9%E6%B2%BFx%E8%BD%B4%E8%BF%90%E5%8A%A8%2C%E5%AE%83%E7%9A%84%E4%BD%8D%E7%BD%AE%E5%9D%90%E6%A0%87x%E4%B8%8E%E6%97%B6%E9%97%B4t%E7%9A%84%E5%85%B3%E7%B3%BB%E4%B8%BAx%3D2t2-3t%2C%E7%94%B1%E6%AD%A4%E5%8F%AF%E7%9F%A5t%3D2s%E6%97%B6%E5%AE%83%E7%9A%84%E9%80%9F%E5%BA%A6%E5%92%8C%E5%8A%A0%E9%80%9F%E5%BA%A6%E7%9A%84%E5%A4%A7%E5%B0%8F%E5%88%86%E5%88%AB%E4%B8%BAA%EF%BC%8E-3m%2Fs%2C4m%2Fs2+B%EF%BC%8E2m%2Fs%2C2m%2Fs2C%EF%BC%8E-1m%2Fs%2C2m%2Fs2+D%EF%BC%8E1m%2Fs%2C4m%2Fs2%E9%A2%98%E6%B2%A1%E6%8A%84%E9%94%99)
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