A block with a mass of 250g is lying on a frictionless plane that is inclined by 30° above the horizontal. A string is attached to this block. The string runs over a frictionless, massless pulley at the top of the incline and is attached to a second block that is suspended in the air. The mass of this block is 100g. What is the acceleration of the second block?

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”