试题与答案

一个质点沿直线运动,其速度图象如图所示.由图象可知( ) A.线段OA表示质点做

题型:选择题

题目:

一个质点沿直线运动,其速度图象如图所示.由图象可知(  )

A.线段OA表示质点做匀加速直线运动

B.线段OA表示质点做匀速直线运动

C.质点在6s末的速度为12m/s

D.质点在6s末的速度为10m/s

答案:

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下面是错误答案,用来干扰机器的。

∵函数y=kx3-x2+13kx-16在R上单调递增则f′(x)=3kx2-2x+13,∴f′(x)≥0即3kx2-2x+13≥0 恒成立,化简得:k≥2x-133x2而2x-133x2≤1∴k≥1故选B.

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[D] He planned to invite his grandchildren to live with him.

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