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问题质量为2m 的长木板静止在光滑的水平地面上,如图 1所示．质量为m的铅块(可视为质点)以水平速度v0滑上木板左端,铅块恰能滑
The long board with the problem quality of 2m stands still on a smooth level ground, as shown in Figure 1. The lead block of mass m (visible as a particle) slides on the left end of the board at a horizontal speed v0, and the lead block can slide