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प्रश्न
We make useful objects from a variety of substances. Another use of substances is that we get energy from some of them.
When we have run a long distance, we feel tired. We have to stop. Why is that?
एका वाक्यात उत्तर
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उत्तर
When we run, energy in our body is depleted. When we stop for some time, again the energy is formed in the body and then we can resume running.
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