求解一道物理运动学难题有a,b2个小车,b在前面,a在后面,a和b有84米的间距.a车保持20m/s的速度不变向右边行驶,b车初速度为4m/s,加速度为2m/s^2,也是向右行驶(a,b的速度都向右,b的加速度也向右).
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![求解一道物理运动学难题有a,b2个小车,b在前面,a在后面,a和b有84米的间距.a车保持20m/s的速度不变向右边行驶,b车初速度为4m/s,加速度为2m/s^2,也是向右行驶(a,b的速度都向右,b的加速度也向右).](/uploads/image/z/4521318-6-8.jpg?t=%E6%B1%82%E8%A7%A3%E4%B8%80%E9%81%93%E7%89%A9%E7%90%86%E8%BF%90%E5%8A%A8%E5%AD%A6%E9%9A%BE%E9%A2%98%E6%9C%89a%2Cb2%E4%B8%AA%E5%B0%8F%E8%BD%A6%2Cb%E5%9C%A8%E5%89%8D%E9%9D%A2%2Ca%E5%9C%A8%E5%90%8E%E9%9D%A2%2Ca%E5%92%8Cb%E6%9C%8984%E7%B1%B3%E7%9A%84%E9%97%B4%E8%B7%9D.a%E8%BD%A6%E4%BF%9D%E6%8C%8120m%2Fs%E7%9A%84%E9%80%9F%E5%BA%A6%E4%B8%8D%E5%8F%98%E5%90%91%E5%8F%B3%E8%BE%B9%E8%A1%8C%E9%A9%B6%2Cb%E8%BD%A6%E5%88%9D%E9%80%9F%E5%BA%A6%E4%B8%BA4m%2Fs%2C%E5%8A%A0%E9%80%9F%E5%BA%A6%E4%B8%BA2m%2Fs%5E2%2C%E4%B9%9F%E6%98%AF%E5%90%91%E5%8F%B3%E8%A1%8C%E9%A9%B6%EF%BC%88a%2Cb%E7%9A%84%E9%80%9F%E5%BA%A6%E9%83%BD%E5%90%91%E5%8F%B3%2Cb%E7%9A%84%E5%8A%A0%E9%80%9F%E5%BA%A6%E4%B9%9F%E5%90%91%E5%8F%B3%EF%BC%89.)
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