求解一道微积分应用题.At time t>=0 seconds,the position of a body moving along the x-axis is x(t)=t^3-21t^2+144t m.(1)Find the body's speed each time the acceleration is zero.Enter your answer as a list if necessary.(2) Find the total distan
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![求解一道微积分应用题.At time t>=0 seconds,the position of a body moving along the x-axis is x(t)=t^3-21t^2+144t m.(1)Find the body's speed each time the acceleration is zero.Enter your answer as a list if necessary.(2) Find the total distan](/uploads/image/z/8231712-24-2.jpg?t=%E6%B1%82%E8%A7%A3%E4%B8%80%E9%81%93%E5%BE%AE%E7%A7%AF%E5%88%86%E5%BA%94%E7%94%A8%E9%A2%98.At+time+t%3E%3D0+seconds%2Cthe+position+of+a+body+moving+along+the+x-axis+is+x%28t%29%3Dt%5E3-21t%5E2%2B144t+m.%281%29Find+the+body%27s+speed+each+time+the+acceleration+is+zero.Enter+your+answer+as+a+list+if+necessary.%282%29+Find+the+total+distan)
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