Answer :

Distance covered, d= 200 m

Time in which she covered the 200m distance, t = 1minute 57.56 seconds = 117.56 seconds


Power exerted in this time period = 460 W or J/s


Work done in covering this distance with given conditions, W = Power × Time


= 460 × 117.56


= 54077.6 J


Also, this work done W = Force × distance covered


Magnitude of this force of resistance = W/d


= 54077.6/200


= 270.388 N


≈ 270 N


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