What is the difference between contact and action-at-a-distance forces?
A. Action-at-a-distance forces are stronger than contact forces.
B. Contact forces are stronger than action-at-a-distance forces.
C. Contact forces require objects to physically touch, while action-at-a-distance forces do not.
D Action-at-a-distance forces require objects to physically touch, while contact forces do not.

A

Contact forces are forces that require the actual contact (touching) of two pieces of matter. ... A field force is a force that works at a distance. No touching is required. Gravity is a good example of a field force, because it works whether or not an object is touching something or touching nothing at all.

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

answera compound;