Question

In collisions why is equation of e always written along the common normal ?

Answer 1

@Miracrown Could you help me out ?

Answer 2

what do you mean by 'equation of e' ?

Answer 3

Coefficient of restitution (e)= Velocity of separation/ Velocity of approach

Answer 4

ok - now i don't know what you mean by 'along the common normal'

Answer 5

are you considering collisions in one dimension ?

Answer 6

Yes .

Answer 7

i don't see how else you could define e