Question

Suppose the entire population of the Earth gathers at one spot and, at the sound of a prearranged signal, everyone jumps up. About a second later, 5 billion people land back on the ground. After the people have landed, Earth’s momentum is?

Answer 1

The Earth's momentum would be the same as it was before everyone jumped up.

Step-by-step explanation:

A thermodynamic system that cannot exchange either energy or matter outside the confines of it boundary is know as an isolated system.

Earth is an isolated or close system because for matter to leave the earth's atmosphere it must break the physical laws.

For a closed or an isolated system, according to the Law of conservation of momentum, the total momentum does not change.

what this total momentum means is the sum of momentum before and after the collision

Now because earth is a closed system, the total momentum of the earth + the people before the jump will be the same when the people have landed

Now the main reason for this is because it is not possible to change the momentum of an isolated system from within the system,considering the fact that the people are all within the atmosphere of earth.

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