NEET-XII-Physics
neet 2020 questions with solutions year:2020
- #13Two particles of mass `` 5\,kg `` and `` 10\,kg `` respectively are attached to the two ends of a rigid rod of length 1m with negligible mass.
The centre of mass of the system from the `` 5\,kg `` particle is nearly at a distance of :
(A)33 cm
(B)50 cm
(C)67 cm
(D)80 cm
digAnsr: CAns : Let position of centre of mass be `` {(x_{c.m}, 0)} ``
`` x_{cm}=\frac{m_{1}x_{1}+m_{2}x_{2}}{m_{1}+m_{2}} ``
`` =\frac{5 \times 0+100 \times 10}{5+10} ``
`` =\frac{200}{2} ``
`` =66.66\,cm ``
`` x_{cm}=67\,cm ``