1 2 In the diagram above, block 1 is stacked on top of block 2. The blocks are at rest on a flat plane. The mass of each block is known. To which system could we apply Newton's laws in order to find the magnitude of the contact force between the blocks? Mark all systems that are useful for this purpose. The "block 1 system" is useful for finding the contact force between blocks 1 and 2. The "block 2 system" is useful for finding the contact force between blocks 1 and 2. The "blocks 1 and 2 system" is useful for finding the contact force between blocks 1 and 2.

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