Suppose two children push horizontally, but in exactly opposite directions, on a wagon containing a third child. The first child exerts a force of F, = 75.0 N, the second a force of F, = 96.0 N, friction is 12.0 N, and the mass of the third child plus wagon is 26.0 kg. (a) What is the system of interest if the acceleration of the child in the wagon is to be calculated? (Select all that apply.) the child in the wagon the wagon the children outside the wagon

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