If forces acting on an object are unbalanced, which factor may result from an unbalanced force

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If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

Atruck driver is attempting to deliver some furniture. first, he travels 8 km east, and then he turns around and travels 3 km west. finally, he turns again and travels 13 km to his destination. what is the drivers distance