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Assertion: There is no apprecible change...

Assertion: There is no apprecible change in the position of the body during the action of the impulsive force.
Reason: In case of impulsive force the time of action of the force is very short.

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The time of action of the force is very short, therefore one can assume that there is no apprecible change in the position of the body during the action of the impulsive force.
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