Q. Two bodies $A$ and $B$ of definite shape (dimensions of bodies are not ignored). $A$ is moving with speed of 10 $ms^{- 1}$ and $B$ is in rest, collide elastically. The
A) Body $A$ comes to rest and $B$ moves with speed of 10$ms^{- 1}$
B) They may move perpendicular to each other
C) $A$ and $B$ may come to rest
D) They must move perpendicular to each other
Explanation
(b) (a) This is only possible when collision is head on elastic.
(b) When collision is oblique elastic, then in this case, both bodies move perpendicular to each other after collision
(c) Since, in elastic collision, kinetic energy of system remains constant so, this is not possible.
(d) The same reason as (b).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.