Answer :
The correct answer for the isolated systems is options 2 & 4.
2) A ball is dropped from the top of a building. The system is the ball and the earth.
4) A car slides to a halt in an emergency. The system is the car.
In both of these systems, the isolated system is the object in motion, either the ball dropped from the top of the building or the car sliding to a halt in an emergency. The conservation of linear momentum is applicable because the system does not interact with any external forces or objects.
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