Question

if action is always equal to reaction explain how a horse can pull a cart??​

Answer 1

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According to Newton's third law of motion, action force is equal to reaction but acts on two different bodies and in opposite directions. When a horse pushes the ground, the ground reacts and exerts a force on the horse in the forward direction. This force is able to overcome friction force of the cart and it moves.

Answer 2

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when horse tries to pull a cart, it applies both on the ground with the feet in backward direction. due to this force (action) , a reaction is given to the feet of the horse by the ground in forward direction. this reaction force enables the horse to pull the cart . when the pulling force by horse become greater than the force of friction between The wheels of the cart and the ground then the car starts moving and the horse pulls the cart