Q: Figure shows two identical particles 1 and 2, each of mass m, moving in opposite directions with same speed v along parallel lines. At a particular instant r1 and r2 are their respective position vectors drawn from point A which is in the plane of the parallel lines. Choose the correct options.
(a) Angular momentum L1 , of particle 1 about A is L1 = m v d1 ⨀
(b) Angular momentum L2 of particle 2 about A is L2 = m v d2 ⨀
(c) Total angular momentum of the system about A is L = mv(r1 + r2 ) ⨀
(d) Total angular momentum of the system about A is L = mv(d2 + d1 ) ⊗
⨀ represents a unit vector coming out of the page
⊗ represents a vector going into the page.
Ans: (a) , (b)