It's a school thing you write or draw something with it
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the resistance if a force f acting on a ball of radius r moving with velocity v is given by F=krv,the dimensional formula of K is
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Its a pencil that you can write or draw something on it. "have a pencil and paper ready".
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An instrument for writing or drawing, consisting of a thin stick of graphite or a similar substance enclosed in a long thin piece of wood or fixed in a cylindrical case.
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