an unbalanced external force is needed to initiate the motion from state of rest but no unbalanced net force is needed to sustain the uniform motion justify
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may be Newton's first law of motion can explain this....
a body at rest will remain at rest and a body in motion will continue its motion until no unbalanced or external force comes into play....
like asteroids in space keep moving since there is no resistance force there......
well I am not sure about my answer but this might be a reason......
a body at rest will remain at rest and a body in motion will continue its motion until no unbalanced or external force comes into play....
like asteroids in space keep moving since there is no resistance force there......
well I am not sure about my answer but this might be a reason......
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