Question

what is here meant by upper part and lower part.
Explain the given example​

Answer 1

Answer:

upper part means the part of our body which is not in contact with floor of bus that is the body portion above our legs

it does not happens with lower part as it is in direct contact of bus floor and suddenly it also changes in inertia of motion when bus comes in motion

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Answer 2

Answer:

Explanation:

Lower part means the part which is present on surface of vehicle moving along with it like feet

Upper part means the part which is not connect with vehicle but move with same speed as vehicle in motion like shoulders and back.

These part oppose the change in motion due to its inertia