A bird sitting on a hinged perch takes off from the perch, pushing the perch
in the opposite direction. The momentum of the perch

The momentum of the perch is equal to it's own momentum gather to take off

Explanation:

According to the Newton third law of motion which state that: in every action, there will be an equal and opposite reaction.

This is the law that helps us to walk, paddle boats e.t.c.

And momentum is always conserved. Therefore, the momentum of the perch is equal to it's own momentum gather to take off

i believe it is b. what was the cause of the big bang

hope this !

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.