The 200 m free style women's swimming gold medal at Seol Olympic 1988 went to Heike Friendrich of East Germany when she set a new Olympic record of 1 minute and 57.56 seconds. Assume that she covered most of the distance with a uniform speed and had to exert 460 W to maintain her speed. Calculate the average force of resistance offered by the water during the swim.

Answer

B

Explanation

`t=1 min 57.56sec =117.56sec
`p=460W, s=200m`
`p=W/t`
work`W=pt=460xx117.56J`
Again `W=FS`
`rarr F=W/S`
`=(460xx117.56)/200`
`270.3=270N`