Two friends are standing on opposite ends of a canoe that is initially at rest with respect to a frictionless lake. the person in the front throws a very massive ball toward the back, and the person in the back catches it. after the ball is caught the canoe is

Here we can say that the momentum of the system will remain conserved

As here we can see that there is no external force in horizontal direction

so here we can say that

As the person in front throw the ball towards back the canoe will start moving forward direction so that momentum of the system will remain conserved

now after this we can say momentum of ball + canoe + two friends = 0 always

now when the person at the back of the canoe will catch the ball then again due to the concept of momentum conservation we can say that the whole system will again comes to rest

so the canoe will become at rest after the person at the back will catch the ball

i need the answer to this too but idk it ; -;

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