Question

An athletes pushes the earth backward with his hand and feet ,
Just before start the race give reason

Answer 1

An athlete pushes the earth backward with his hand and feet,just before starting the race because according to third law of newton every action has an opposite and equal reaction so when the athlete pushes the earth with force earth also exert force on it.

Answer 2

because according to the third law of motion when two body interact each other equal and opposite reaction occur