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2008年理综高考试题全国卷Ⅰ的第24题图1中滑块和小球的质量均为 m,滑块可在水平放置的光滑固定导轨上自由滑动,小球与滑块上的悬点 O 由一不可伸长的轻绳相连,轻绳长为 l.开始时轻绳处于水平拉直状态,小球和滑块均静止.现将小球由静止释放,当小球达到最低点时,滑块刚好被一表面涂有粘性物质的固定档板粘住,在极短的时间内速度减为零.小球继续向左摆动,当轻绳与竖直方向的夹角θ=60°时小球达到最高点.求
The 24th issue of the 2008 National Comprehensive Examination Questions in National Vol. I In Figure 1, the mass of the slider and the ball is m, and the slider can slide freely on the horizontally-placed, smooth fixed rail, and the ball and the suspension point on the slider. O is connected by an inextensible light rope, the length of the light rope is l. At the beginning, the light rope is in a horizontal straightening state, the ball and the slider are both stationary. Now the ball is released from rest, when the ball reaches the lowest point The slider is just stuck to a fixed baffle coated with a viscous material. The speed is reduced to zero in a very short time. The ball continues to swing to the left when the angle between the light rope and the vertical direction is θ=60°. When the ball reaches the highest point.