点M作直线运动,由始点经过t秒后的距离是s=(1、4)t……4-4t……3+16t……2,则速度为0的时刻是A4s末B8s末C0s,8s末D0s,4s,8s末是:s=(1/4)t^4-4t^3+16t^2
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![点M作直线运动,由始点经过t秒后的距离是s=(1、4)t……4-4t……3+16t……2,则速度为0的时刻是A4s末B8s末C0s,8s末D0s,4s,8s末是:s=(1/4)t^4-4t^3+16t^2](/uploads/image/z/5213355-51-5.jpg?t=%E7%82%B9M%E4%BD%9C%E7%9B%B4%E7%BA%BF%E8%BF%90%E5%8A%A8%2C%E7%94%B1%E5%A7%8B%E7%82%B9%E7%BB%8F%E8%BF%87t%E7%A7%92%E5%90%8E%E7%9A%84%E8%B7%9D%E7%A6%BB%E6%98%AFs%3D%EF%BC%881%E3%80%814%EF%BC%89t%E2%80%A6%E2%80%A64-4t%E2%80%A6%E2%80%A63%2B16t%E2%80%A6%E2%80%A62%2C%E5%88%99%E9%80%9F%E5%BA%A6%E4%B8%BA0%E7%9A%84%E6%97%B6%E5%88%BB%E6%98%AFA4s%E6%9C%ABB8s%E6%9C%ABC0s%2C8s%E6%9C%ABD0s%2C4s%2C8s%E6%9C%AB%E6%98%AF%EF%BC%9As%3D%281%2F4%29t%5E4-4t%5E3%2B16t%5E2)
点M作直线运动,由始点经过t秒后的距离是s=(1、4)t……4-4t……3+16t……2,则速度为0的时刻是A4s末B8s末C0s,8s末D0s,4s,8s末是:s=(1/4)t^4-4t^3+16t^2
点M作直线运动,由始点经过t秒后的距离是s=(1、4)t……4-4t……3+16t……2,则速度为0的时刻是
A4s末
B8s末
C0s,8s末
D0s,4s,8s末
是:s=(1/4)t^4-4t^3+16t^2
点M作直线运动,由始点经过t秒后的距离是s=(1、4)t……4-4t……3+16t……2,则速度为0的时刻是A4s末B8s末C0s,8s末D0s,4s,8s末是:s=(1/4)t^4-4t^3+16t^2
ds/dt=t^3-12t^2+32t
=t(t-4)(t-8)
选D