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What is the tension in the rope that connects the boxes? What is the mass m of the second box?  Two boxes connected by a light horizontal rope are on a horizontal surface. The coefficient of kinetic friction between each box and the surface is .3. One box (box B) has a mass 4.65 kg, and the other box (box A) has mass m. A force F with magnitude 40.3 N and direction 53.1 degrees above the horizontal is applied to the 4.65 kg box, and both boxes move to the right with 1.5 m/s^2.

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When the boxes are dragged, they move with the same speed and acceleration.

The combined drag on the boxes is 0.3(m + 4.65)*9.8 where 0.3 is the coefficient of kinetic friction and 9.8 is the acceleration due to gravity. (m+4.65)*9.8 is the total downward force, and the force due to friction is 0.3 of this.

To work out the horizontal forward force applied to...

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