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On 2016/Dec/03, at 17:07, Surendranath via Phys-l <phys-l@mail.phys-l.org> wrote:
The result can also be arrived at using
V1 f- V2f = V2i - V1i (coefficient restitution is 1 for perfectly elastic
collisions)
I would teach this after the students are initially exposed to conservation
of momentum and KE and have worked out a few problems using those ideas.
The bring in the idea of coefficient of restitution, use that in a few
problems and finally V1f = 2Vcm - V1i
Please take a look at this animation.
http://www.surendranath.org/GPA/Dynamics/Collisions/Collisions.html <http://www.surendranath.org/GPA/Dynamics/Collisions/Collisions.html>
Best Wishes,
Surendranath
www.surendranath.org <http://www.surendranath.org/>
www.youtube.com/user/Surendranath1954 <http://www.youtube.com/user/Surendranath1954>
https://play.google.com/store/search?q=pub:Surendranath.B <https://play.google.com/store/search?q=pub:Surendranath.B>.