Class 11

System of Particles and Rotational Motion question bank (Physics)

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Q1.

Two objects of masses $200 \ gm$ and $500 \ gm$ possess velocities $10 \hat{i} \ m/s$ and $3 \hat{i} + 5 \hat{j} \ m/s$ respectively. The velocity of their centre of mass in $m/s$ is

(A)

$5 \hat{i} - \frac{25}{7} \hat{j}$

(B)

$\frac{5}{7} \hat{i} - 25 \hat{j}$

(C)

$5 \hat{i} + \frac{25}{7} \hat{j}$

(D)

$25 \hat{i} - \frac{5}{7} \hat{j}$

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Q2.

$A$ system consists of $3$ particles each of mass $m$ located at $(1, 1), (2, 2),$ and $(3, 3)$. The coordinates of the centre of mass are

(A)

$(6, 6)$

(B)

$(3, 3)$

(C)

$(2, 2)$

(D)

$(1, 1)$

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