Draw a free body diagram for the child.
Calculate the net force acting on the child.
Calculate the force between the child and the floor of the elevator.
a) Let's draw a free body diagram for the child:
b)Let's calculate the net force acting on the child. Applying the Newton's Second Law of Motion, we get:
c) The force between the child and the floor of the elevator (or the normal force) can be found as follows:
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