Answer :
A girl can increase the total energy of this system by standing on a table while swinging the yo-yo. Thus, the correct option is B.
What is Yo-yo?
Yo-yo may be defined as a type of toy that consists of a pair of joined discs with a deep furrow between them in which thread is attached and wound.
By reversing the direction of the swing, swinging the yo-yo at a lower speed, and sitting on the ground while swinging the yo-yo decrease the total energy of the system. This is because the system does not have the momentum that is required to increase its overall energy.
Therefore, a girl can increase the total energy of this system by standing on a table while swinging the yo-yo. Thus, the correct option is B.
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