Understanding the concept of tension

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Tension in a system with two masses being pulled by a force can be confusing. In this scenario, mass m1 (10kg) and mass m2 (15kg) are connected by a rope and pulled to the right with a force of 50N. The tension in the rope acts in opposite directions on each mass; it pulls m1 to the right and m2 to the left due to the connection between them. The differing masses and the pulling force create a dynamic where tension is influenced by the overall system's acceleration. Understanding the arrangement of the masses and the direction of the applied force clarifies why tension behaves this way.
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This is a general question about tension.

Two mass m1 (10kg) and m2 (15kg) are pulled with a pulling force of 50N.

It was explained to me that the tension in mass 1 acts to the right and the tension in mass 2 acts to the left, why??
If they are being pulled in the same direction(to the right) then why isn't the tension acting to the right for both masses??
 
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how are the blocks placed? and how is the string(rope etc) connected?
 

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