由D点以4M/S的速度划上固定的光滑斜面,途径AB两点,抑制物体在A点时的速度是B点时的2倍；由B点在经过0.5S如图所示，一物体由低端D点以4M/S的速度划上固定的光滑斜面，途径AB两点，抑制物体

由D点以4M/S的速度划上固定的光滑斜面,途径AB两点,抑制物体在A点时的速度是B点时的2倍；由B点在经过0.5S如图所示，一物体由低端D点以4M/S的速度划上固定的光滑斜面，途径AB两点，抑制物体
由D点以4M/S的速度划上固定的光滑斜面,途径AB两点,抑制物体在A点时的速度是B点时的2倍；由B点在经过0.5S
如图所示，一物体由低端D点以4M/S的速度划上固定的光滑斜面，途径AB两点，抑制物体在A点时的速度是B点时的2倍；由B点在经过0.5S，物体滑到斜面最高点C时恰好速度为零，设AB=0.75M,求：（1）斜面的长度（2)物体由低端D点滑到B点时所需的时间

由D点以4M/S的速度划上固定的光滑斜面,途径AB两点,抑制物体在A点时的速度是B点时的2倍；由B点在经过0.5S如图所示，一物体由低端D点以4M/S的速度划上固定的光滑斜面，途径AB两点，抑制物体
设倾斜角为a,光滑斜面故加速度为g*sina,设B点速度为v,由物体在A点时的速度是B点时的2倍可得1.5v^2=gh(h为AB所对应的高度）,则h=AB*sina.再由B点在经过0.5S,物体滑到斜面最高点C时恰好速度为零,可知加速度g*sina=2v.由以上三式可得倾斜角a,故可得加速度g*sina.此时可知运动所用时间t,长度为0.5g*sina*t^2(这是反着来看从C到D,即以匀加速g*sina运动ts).第二问利用前面的t减去0.5就是.

Body Jewelry Shopping is an online wholesale shop offering the latest fashion jewelry and wholesale jewelry from Thailand,wholesale cheap clothes, China and KoreaOur wholesale fashion jewelry collecti...

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