1.

Two balls A & B of mass m_(1) and m_(2) are kept on a horizontal smooth surface. A is given a velocity towards B so that they perform head on collision

Answer»

If `m_(1)=m_(2)` and collision is ELASTIC. A stops and `B` moves with the velocity of `A` after collision
Impulses on `A` and `B` during collision are same in magnitude whether it is elastic or inelastic collision
Impulses on `A` and `B` collision are equal in magnitude only if `m_(1)=m_(2)`
If `m_(1)gtm_(2)`, though impulses are same in magnitude velocity of `A` is still the same direction.

Solution :IMPULSE exist in action reaction pair during collision so magnitude will REMAIN the same.
(a) Elastic collision principle
(b) Internal force
(c) If `m_(1)GT gt gt m_(2)`
Direction of velocity of motion does not change
`vecv_(1)(1+e)vecv_(c)=evecv_(1)(vecv_(c)~~vecv_(1))`
`vecv_(1)=vecv_(c)`


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