.São feitas as seguintes afirmações acerca das Leis de Newton: I. Um corpo pode permanecer em repouso quando estiver sob a ação de forças externas. II. As forças de ação e reação têm resultante nula, provocando sempre o equilíbrio do corpo em que atuam. III. A força aplicada sobre um corpo, pela Segunda Lei de Newton, é o produto de sua massa pela aceleração que o corpo possui. é(são) correta(s):

All the three statements are all true. Although, statement I is true for Netwon's first law of motion, but statement II supports the Newton's third law of motion and statement III supports Newton's second law of motion.

Explanation:

Examining the statements one at a time

I. A body can remain at rest when it is under the action of external forces.

This is obtained from the teachings of the Newton's first law of motion.

Every object continues in its state of rest, inertia or uniform motion unless acted upon by an external force. For a body at rest or in a state of uniform motion, the external forces acting on the body isn't necessarily strictly required to be zero. The most major point is that the resultant of all of the external forces has to be zero for the body to remain at rest or a state of uniform motion.

II. The forces of action and reaction have resulted in zero, always causing the balance of the body in which they act.

This is obtained from the Newton's third law of motion that action and reaction are equal and opposite. The reactive force is always due to the active force and it is always equal and opposite to this active force that together, they form a system of forces with resultant of zero and leading to the balance of the bodies on which they act.

III. The force applied to a body, by Newton's Second Law, is the product of its mass by the acceleration that the body has.

This is the most basic Interpretation of the Newton's second law, F = ma.

Hope this Helps!!!

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