आश्य स्पष्ठ कीजिय।
क) संसार कमजोर आदमियो के लिये नही हैं।
ख) भिन्न देश, काल और आबश्यक्ता एंड उम्र के हिसाब से ब्यायाम करना साहिये।
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The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. ... Velocity is a physical vector quantity; both magnitude and direction are needed to define it.
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