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Welcome my dear student.
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In this question, there are two bodies of mass m1 and m2.
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So one mass is m1, another mass, body has mass m2.
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So both are moving with some kind of velocity.
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Suppose this particular is moving with velocity v1 and this particular is moving with velocity v2.
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So now it has been given in the question that both are moving with equal momentum.
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So momentum is same.
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Momentum is same for both the body.
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It is given in the statement.
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Now you are asked to calculate the ratio of kinetic energy.
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So for this body, suppose the body 1 is moving with kinetic energy ke1 and the body 2 is moving kinetic energy ke2.
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So you are asked to calculate the ratio of kinetic energy 1 to kinetic energy 2...