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水平直轨道上有一辆小车,轨道的O点上方有一轻小滑轮,通过滑轮以匀速v收绳,小车被绳拉着在轨道上运动,如图1所示,则当牵引绳与水平方向的夹角为θ的瞬时,小车的速度多大?
There is a trolley on the horizontal straight track, there is a small pulley above the O point of the track, and the trolley is pulled on the track by the rope at constant speed v, as shown in FIG. 1, Angle between the moment of θ, the car how much speed?