Answer:
d) very tired and coming down to rest
Explanation:
The momentum of an object is defined to be the product of the object and its velocity. So in the case where one of the component is 0 (i.e. object comes down to zero speed to rest), then the total momentum of the flock of identical birds is zero when they are very tired and coming down to rest.
The total momentum of a flock of identical birds could be zero only if the birds are very tired and coming down to rest. Option D is correct.
Momentum:
It is defined as the product of the mass and velocity of the object. It is measure in kg.m/s. It is denoted by p.
p = m.v
Where,
p - momentum
m- mass
v - velocity
Thus, the momentum of an object depends upon the mass or velocity of the object.
The momentum will be zero, only when either mass or velocity become zero. Since, mass of bird cannot be zero. Velocity will be zero when birds, be in rest.
Therefore, the total momentum of a flock of identical birds could be zero only if the birds are very tired and coming down to rest.
To know more about momentum,
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