A closed system consists of 2 objects. Initially, object A has amomentum of 36 k

Question

A closed system consists of 2 objects. Initially, object A has amomentum of 36 kg·m/snorth and object B has a momentum of 81 kg·m/s south. The twoobjects have a head-on collision. Afterwards, object A is observedto have a momentum of 26 kg·m/ssouth. After the collision, what is object B'smomentum?
_____________ kg·m/s

East
West Up
Down
North
South
Left
Right
No direction because object B hasstopped East
West Up
Down
North
South
Left
Right
No direction because object B hasstopped East
West Up
Down
North
South
Left
Right
No direction because object B hasstopped East
West Up
Down
North
South
Left
Right
No direction because object B hasstopped

Explanation / Answer

Momentum of A before collision p = 36 j

Momentum of B before collision p ‘ = 81 (-j)

Momentum of A after collision P = -26 j

From law of conservation of momentum p + p ‘ = P + P‘

From this momentum of B after collision P ‘ = (p+p’ )- P

                                                                        =-19 j

i.e., in south direction

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