Mass is distributed uniformly over a thin triangular \( \mathrm{P} ...

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Mass is distributed uniformly over a thin triangular
\( \mathrm{P} \) plate and positions of two vertices are given by

W \( (1,3) \) and \( (2,-4) \). What is the position of \( 3^{\text {rd }} \) vertex if centre of mass of the plate lies at the origin?
(1) \( (1,-2) \)
(2) \( (-2,4) \)
(3) \( (-3,1) \)
(4) \( (1,2) \)
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