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Two identical blocks each start at rest from the same height and slide down surfaces inclined at the same angle θ, as shown. In Figure 1, there is negligible friction between the block and the surface, while in Figure 2 , the surface is rough and the coefficient of kinetic friction between the block and the surface is μ . The acceleration of the block in Figure 1 is a1, and the acceleration of the block in Figure 2 is a2. The value of the ratio a1/a2 is
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