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【简答题】
在图(a)所示系统中，滑块A和小球B的质量均为m 1 ，小球可视为质点，均AB的质量为m 2 ，长为2l，它的一端与小球固结，另一端与滑块铰接，滑块可在固定水平滑槽内自由滑动。设初始时系统静止φ=0，求在重力作用下，当φ=90°时[图(b)]滑块和小球的绝对速度。
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