Author Question: The total momentum of a flock of identical birds could be zero only if the birds are A) taking ... (Read 101 times)

mynx · **on:** Jul 29, 2018

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

A) taking off from the ground.
B) flying in the same direction.
C) flying in different directions.
D) very tired and coming down to rest.

Question 2

Just after a big fish swallows a small fish, the momentum of the two-fish system is

A) greater after lunch than before.
B) the same before and after lunch.
C) somewhat less after lunch.