Science (Balanced/Unbalanced Forces)

"Toy Car A" is propelled by elastic force. The other forces acting on the car are gravity (pulling the car down) and friction force (between the car and the floor). What UNBALANCED forces are acting on the car?

"Toy Car B" is propelled by air resistance. The other forces acting on the car are also gravity and friction force. What BALANCED forces are acting on the car?

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