Question

If you have elastic collision between two objects m1 and m2 , what principles may you...

If you have elastic collision between two objects m1 and m2 , what principles may you apply?

A.

Conservation of momentum only
B.

Conservation of momentum and conservation of total energy
C.

None of the conservation principles
D.

Conservation of mass only
E.

Conservation of total energy only
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Homework Answers

Answer #1

Elastic collision is by definition Energy conservation. So, conservation of total energy is definitely applicable here.

Now, in case of collision, no external force is acting on the colloding bodies.

According to 2nd Law of Newton, The force is defined by the rate of change of momentum. So no force means no change of momentum, i.e. momentum conservation.

As there is no external force acting on the colliding bodies, the total momentum of them should be conserved.

So, momentum conservation is also applicable here.

Correct option is option B.

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