Question

Two objects of mass 10 kg and 20 kg respectively are connected to the two ends of a rigid rod of length 10 m with negligible mass. The distance of the center of mass of the system from the 10 kg mass is:

• A. $\frac{10}{3} m$
• B. $\frac{20}{3} m$
• C. $10 m$
• D. $5 m$

Answer 1

Answer: (B)

$\frac{20}{3} m$

Answer 2

The correct option is (B) : $\frac{20}{3} m$.

$x = [\frac{m_{2r}}{(m_1+m_2)}]$
$= [\frac{20(20)}{(20+10)}]$
$= \frac{200}{30}$
$= \frac{20}{3}$