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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?
एक पंक्ति में उत्तर
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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