Discuss which reference body should be chosen when determining: 1) the time the rocket is removed from the launch pad

Discuss which reference body should be chosen when determining: 1) the time the rocket is removed from the launch pad; 2) the distance by which, in time t (s), the balloon is removed from the child who released it from the hands; 3) the time of the passenger’s transition from one carriage to another.

1) Reference body: launch pad:
2) Reference body: child:
3) Reference body: carriage walls.

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