12.如图所示物块以速度v 沿水平面由a点�到b点克服�擦力做的功为w1 该物块以初速 v 由a′点经过两斜面运动到b′点克服�擦力做 Template




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tomski12.如图所示物块以速度v 沿水平面由a点�到b点克服�擦力做的功为w1 该物块以初速 coloring