Q 11-06-014NEETNEET 2020Top questionEasy
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 :
Answer: (C) $67$ cm
Taking the $5$ kg particle as origin:
$$x_{cm} = \frac{5 \times 0 + 10 \times 1}{5 + 10} = \frac{2}{3}\ \text{m} \approx 67\ \text{cm}$$
Solution by Sreeraj P, M.Sc Physics