Question

why does a boatman push the water backward with the oars while rowing a boat

Answer 1

hii
the boat man push the water backward because of third law of motion which is " every action has an equal and opposite reaction"

you may know the swimmer also pushes the water backwards to go ahead. Here also the same law occurs. when a boat man push the water backwards the boat feels and opposite action by which it moves forward
hope it will help you
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#DOCTOR STRANGE

Answer 2

a boatman push the water backward with the oars because it gives pressure to water to go back which pulls the water forward and that moves the boat .