Question

A body is said to be in motion if it changes its position with respect to a reference point. If it doesn't change its position?? You are at rest with respect to your co-passenger but in motion with reference to the tree and people outside the train.

Answer 1

Answer:

this is called relative motion. You may not be motion with respect to one set of surroundings but may be in motion with some other set of surroundings.

Explanation:

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Answer 2

Answer:

surrounding

Explanation:

The answer is surrounding