Question

Why does a swimmer push the water backwards?

Answer 1

it is because of newtons third law
every action has an opposite and equal reaction
as he pushes the water backwards the water pushes him forwards
he pushes the water backwards in order to move forward

Answer 2

Answer:

here it is

Explanation:

A swimmer pushes a force on water backwards and then the pushed water give the buoyancy uplift and try to move the body forward. And so that the swimmer able to move forward in his way.

hope it helps...