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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.
There is a car. Its tank is full of fuel but it does not move. Why is that?
एका वाक्यात उत्तर
उत्तर
The car will not move only by filling a tankful of fuel. The fuel should burn and it should form kinetic energy. Then only can the car move.
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