4. a safe is hurled down from the top of a 1.3 x 102 m
building at a speed of 11.0 m/s. what is its velocity as
it hits the ground?

option number c is the right answer.

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

because if the tool that you are using is not balanced it there would be false mass.