explain why acceleration is an external force.
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A change in velocity means, by definition, 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. ... Only external forces affect the motion of a system, according to Newton's first law.
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the rate of change of velocity with time is know as acceleration. when velocity increases also acceleration increases . when velocity constant acceleration will be zero.
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