Two particles of mass 5 kg and 10 kg respectively are attached to the two ends of a rigid rod of length 1 m with negligible mass.The centre of mass of the system from the 5 kg particle is nearly at a distance of :

1. 33 cm

2. 50 cm

3. 67 cm

4. 80 cm

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

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Answer: 3. 67 cm

Take the 5 kg mass as the origin. Centre of mass:

$$x_{cm}=\frac{5(0)+10(100)}{5+10}=\frac{1000}{15}\approx67\ \text{cm}$$

It lies closer to the heavier mass, as expected. Answer: option 3.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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