Center of Mass, Momentum & Collision

JEE Main level, single correct, medium

58 of 130

Question 58 of 130

The coordinates of the centre of mass of a uniform flag-shaped lamina (thin flat plate) of mass 4kg4kg. (The coordinates of the same are shown in the figure) are:

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Answer: (B) (0.75m,1.75m)\left(0.75m,1.75m\right)


r⃗cm=2×(i^2+j^)+2×(i^+5j^2)4{\vec{r}}_{cm}=\dfrac{2\times \left(\dfrac{\hat{i}}{2}+\hat{j}\right)+2\times \left(\hat{i}+\dfrac{5\hat{j}}{2}\right)}{4}
r→cm=34i^+74j^{r^{\rightarrow }}_{cm}=\dfrac{3}{4}\hat{i}+\dfrac{7}{4}\hat{j}

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