speed will be v=3.76msA water skier is being pulled by a tow rope attached to a boat. As the driverpushes the throttle forward, the skier accelerates. A 72kg water skier has aninitial speed of 6.0m/s. 5.0 seconds later, the speed increases to 11.2m/s. What isthe net work done on the water skier? If we assume the efficiency in convertingkinetic energy from the boat to the water skier is only 20%, what is the power ofthe boat? What is the amount of work done by the resistive force during the5-second period?Answer: W =m(v -v)- 3219.84J × 3.2×10°Jnet3219.84JThe power of the boat will be P=-= 3.2x10 W0.2x5s=-3.2×10'W×0.8×5s =-1.3×10ʻJresistiveW.3

Here,m = 72 kgvi = 6 m/svf = 11.2 m/st = 5 sec

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