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In the figure , two blocks are connected by a string, as shown, and the upper block is pulled upward by a different string.

In the figure , two blocks are connected by a string, as shown, and the upper block is pulled upward by a different string. The masses of the upper and lower blocks are 300 grams and 240 grams, respectively. The string between the blocks will break if its tension exceeds 3.6 N, and the string that pulls the combination upward will break if its tension exceeds 7.8 N.

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