Intro to Momentum Video Lessons

Concept

# Problem: The total momentum of a flock of identical birds could be zero only if the birds are A) flying in the direction B) very tired and coming down to rest. C) taking off from the ground. D) flying in different directions.

###### FREE Expert Solution

Momentum:

$\overline{){\mathbf{\Sigma P}}{\mathbf{=}}{\mathbit{\Sigma }}{\mathbf{mv}}}$, where m is the mass and v is the velocity.

The mass of the birds is a constant that cannot change.

Only the velocity can change.

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###### Problem Details

The total momentum of a flock of identical birds could be zero only if the birds are

A) flying in the direction

B) very tired and coming down to rest.

C) taking off from the ground.

D) flying in different directions.