1小明在探究利用杠杆做功的实践活动中将重为15n的重物挂在杠杆的中点用手竖直提起棒的另一端使物体缓慢匀速提升如图1所示.�不计杠杆 Template




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tomski1小明在探究利用杠杆做功的实践活动中将重为15n的重物挂在杠杆的中点用手竖直提起棒的另一端使物体缓慢匀速提升如图1所示.�不计杠杆 coloring