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I was doing a problem in which we have to analyse work done by a man rowing a boat in different scenarios but same displacement wrt water. Basically what I did was calculate force exerted by water molecules upon colliding with the boat and multiplied with their displacement wrt ground. But I am getting wrong answer Can you pls tell mistake in my solution?.

[The correct key given by book is option C]

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  • $\begingroup$ Hello! It is preferable to type out screenshots or images of text; for formulae, one can use MathJax. Thanks! $\endgroup$
    – Jonas
    May 14 at 8:48
  • $\begingroup$ @Jonas Thank you for the advice.I am not very well versed with MathJax so I posted the image. I hope it is visible and readable I will be careful from next time. $\endgroup$
    – Random Guy
    May 14 at 9:14

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