已知质点位置矢量的表示式为r=at^2i+bt^2j (其中a、b为常量),则质点作( )(A)匀速直线运动; (B)变速直线运动;(C)抛物线运动; (D)一般曲线运动.力 F=12ti (SI)作用在质量m=2kg的物
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![已知质点位置矢量的表示式为r=at^2i+bt^2j (其中a、b为常量),则质点作( )(A)匀速直线运动; (B)变速直线运动;(C)抛物线运动; (D)一般曲线运动.力 F=12ti (SI)作用在质量m=2kg的物](/uploads/image/z/6402588-60-8.jpg?t=%E5%B7%B2%E7%9F%A5%E8%B4%A8%E7%82%B9%E4%BD%8D%E7%BD%AE%E7%9F%A2%E9%87%8F%E7%9A%84%E8%A1%A8%E7%A4%BA%E5%BC%8F%E4%B8%BAr%3Dat%5E2i%2Bbt%5E2j+%28%E5%85%B6%E4%B8%ADa%E3%80%81b%E4%B8%BA%E5%B8%B8%E9%87%8F%29%2C%E5%88%99%E8%B4%A8%E7%82%B9%E4%BD%9C%EF%BC%88+%EF%BC%89%EF%BC%88A%EF%BC%89%E5%8C%80%E9%80%9F%E7%9B%B4%E7%BA%BF%E8%BF%90%E5%8A%A8%EF%BC%9B+%EF%BC%88B%EF%BC%89%E5%8F%98%E9%80%9F%E7%9B%B4%E7%BA%BF%E8%BF%90%E5%8A%A8%EF%BC%9B%EF%BC%88C%EF%BC%89%E6%8A%9B%E7%89%A9%E7%BA%BF%E8%BF%90%E5%8A%A8%EF%BC%9B+%EF%BC%88D%EF%BC%89%E4%B8%80%E8%88%AC%E6%9B%B2%E7%BA%BF%E8%BF%90%E5%8A%A8.%E5%8A%9B+F%EF%BC%9D12ti+%28SI%29%E4%BD%9C%E7%94%A8%E5%9C%A8%E8%B4%A8%E9%87%8Fm%EF%BC%9D2kg%E7%9A%84%E7%89%A9)
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