According to Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction, the statement that is always correct among the options provided is:
a. if a moving object hits another object then the second object will push back.
This statement reflects the principle that when one object exerts a force on another, the second object exerts an equal force in the opposite direction. The other statements may not always hold true in every scenario. For example, two moving objects may not necessarily come to a stop after colliding (option b), one object may not always start moving simply because it was hit (option c), and they may not always bounce off each other (option d) depending on the nature of the collision (elastic vs. inelastic).
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