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प्रश्न
Can kinetic energy of a system be increased without applying any external force on the system?
टिप्पणी लिखिए
उत्तर
Yes. Let us consider an isolated system of two particles falling towards each other under their mutual gravitational force of attraction. Here, the net force on the system is zero, but the velocities of the particles keep on increasing. Also, the kinetic energy of the system is increased without applying any external force on it.
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