A boat turns off its engine while traveling at 10 m/s, and then a constant drag force slows the boat to a stop, while traveling an additional 80 m. The mass of the boat is 600 kg . What is the magnitude of the constant drag force, in Newtons, required to stop the boat in 80 m?

the answer is b, have negligible mass

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when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min