Question

4 Acceleration in a system is due to​

Answer 1

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Newton's second law of motion states that the acceleration of a system is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to its mass. ... If the only force acting on an object is due to gravity, the object is in free fall.

Answer 2

A change in velocity means that there is an acceleration. Newton's first law says that a net external force causes a change in motion; thus, we see that a net external force causes acceleration. ..