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  4. Assertion Aristotle stated that an external force is required to keep a body in motion. Reason Opposing forces are always present in the natural world.

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Q. Assertion Aristotle stated that an external force is required to keep a body in motion.
Reason Opposing forces are always present in the natural world.

Laws of Motion

Solution:

Aristotle stated that an external force is required to keep a body in motion as it can be observed in our surrounding, i.e. to move a body, we need to push or pull an object. But Aristotle didn't give any reason behind this fact.
The reason behind this fact is that there are a number of opposing forces like frictions, viscosity, etc. are always present in the natural world. To counter these opposing forces, some external force is required to keep a body in motion.
Therefore, Assertion and Reason are correct and Reason is the correct explanation of Assertion.