质点的瞬时速度公式v=lim△r/△t=dr/dt和瞬时加速度a=lim△v/△t=dv/dt,我这一习题说一质点在XY平面内运动,运动方程为X=3t+5,y=0.5t方+3t-4.问题是写出质点的速度表达式?答案是v=vxi+vyj=dx/dt j+dy/dt j(
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![质点的瞬时速度公式v=lim△r/△t=dr/dt和瞬时加速度a=lim△v/△t=dv/dt,我这一习题说一质点在XY平面内运动,运动方程为X=3t+5,y=0.5t方+3t-4.问题是写出质点的速度表达式?答案是v=vxi+vyj=dx/dt j+dy/dt j(](/uploads/image/z/3912247-55-7.jpg?t=%E8%B4%A8%E7%82%B9%E7%9A%84%E7%9E%AC%E6%97%B6%E9%80%9F%E5%BA%A6%E5%85%AC%E5%BC%8Fv%3Dlim%E2%96%B3r%2F%E2%96%B3t%3Ddr%2Fdt%E5%92%8C%E7%9E%AC%E6%97%B6%E5%8A%A0%E9%80%9F%E5%BA%A6a%3Dlim%E2%96%B3v%2F%E2%96%B3t%3Ddv%2Fdt%2C%E6%88%91%E8%BF%99%E4%B8%80%E4%B9%A0%E9%A2%98%E8%AF%B4%E4%B8%80%E8%B4%A8%E7%82%B9%E5%9C%A8XY%E5%B9%B3%E9%9D%A2%E5%86%85%E8%BF%90%E5%8A%A8%EF%BC%8C%E8%BF%90%E5%8A%A8%E6%96%B9%E7%A8%8B%E4%B8%BAX%3D3t%2B5%2Cy%3D0.5t%E6%96%B9%2B3t-4.%E9%97%AE%E9%A2%98%E6%98%AF%E5%86%99%E5%87%BA%E8%B4%A8%E7%82%B9%E7%9A%84%E9%80%9F%E5%BA%A6%E8%A1%A8%E8%BE%BE%E5%BC%8F%EF%BC%9F%E7%AD%94%E6%A1%88%E6%98%AFv%3Dvxi%2Bvyj%3Ddx%2Fdt+j%2Bdy%2Fdt+j%28)
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