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Semenov [28]
3 years ago
12

Which of the following statements is TRUE?

Physics
1 answer:
lianna [129]3 years ago
8 0

Answer:

a. Momentum is always conserved within a system no matter how we choose the system.

Explanation:

Within a system , the forces possible to be present are only internal. Presence of external force is ruled out. So we can easily apply law of conservation of momentum .

In a lab , we can not define a system which includes earth also because it is present outside lab also.

Elastic collisions are rare in every life because , in most collision , there is loss of energy

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