Why is a knowledge of physics important when building a roller coaster?

Explanation:

because most of the roller coaster moves because of kinetic energy

Roller coasters must follow the physics laws and principles in order for the rides to be safe.

i think the answer would be reserve.

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