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Hello, here we have to solve the following problem.
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Let's start with equation 1.
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Here, two blocks are connected by the string, and the mass of block 1 is 1 kilogram, mass of block 2 is 2 kilograms.
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And acceleration of these blocks is 1 meters per square second.
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We have to find tension in between the blocks.
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Let's make the sketch here.
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M1 experiences gravity, force f up, and it accelerates upwards and it also experiences tension t.
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The second block experiences tension t up and gravity downwards.
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And it accelerates with acceleration a up.
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Therefore, tension minus m2g equals to m2a.
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And therefore, this tension is m2 times g plus a...