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Q.

Particles of masses 1gm, 2gm, 3gm and 4 gm are placed at $x = 1 c m$ , $x = 2 c m$ , $x = 3 c m$ , $x = 4 c m$ respectively. Then $X_{cm} =$

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a

2cm

b

4cm

c

3cm

d

1cm

answer is C.

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Detailed Solution

$X_{CM} = \frac{m_{1} x_{1} + m_{2} x_{2} + m_{3} x_{3} + m_{4} x_{4}}{m_{1} + m_{2} + m_{3} + m_{4}} = 3 cm$

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