1.

In which case work is not done:(A) a girl swimming in a pond(Cya standing man holding a suit case in his hand (D) a sail boat moving in the direction of wind.19.(B) a windmill lifting water from a well

Answer»

work done will be counted if there is a displacement in the direction of applied Forceso in that case for example Work is done when lifting the suitcase up, but you’re not doing workon the suitcaseif you merely move forward and then stop such that the initial and final velocities of the suitcase are the same.



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