Ncert Exercises & Solutions

The figure below shows two identical particles \(1\) and \(2\), each of mass \(m,\) moving in opposite directions with the same speed \(v\) along parallel lines. At a particular instant, \(r_1\) and \(r_2\) are their respective position vectors drawn from point \(A\), which is in the plane of the parallel lines.

Consider the following statements.

(a)	angular momentum \(l_1\) of particle \(1\) about \(A\) is \(l_1=mv(d_1)\) ⊙
(b)	angular momentum \(l_1\) of particle \(2\) about \(A\) is \(l_1=mv(r_2)\) ⊙
(c)	total angular momentum of the system about \(A\) is \(l=mv(r_1+r_2)\) ⊙
(d)	total angular momentum of the system about \(A\) is \(l=mv(d_2-d_1)\) ⊗

Choose the correct option from the given ones:

1.	(a), (c) only
2.	(a), (d) only
3.	(b), (d) only
4.	(b), (c) only

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