wo blocks are connected by a string as shown. The inclination of the ramp is θ = 39° while the masses of the blocks are m1 = 7.8 kg and m2 = 19.6 kg. Friction is negligible.  Write an equation for the magnitude of the acceleration the two blocks experience. Give your equation in terms of m1, m2, θ, and the acceleration due to gravity g. Consider down the ramp to be the negative direction in this calculation.  What is the magnitude of the acceleration of each block in ms2ms2?  Write an equation for the tension in the string in terms of m2, the acceleration due to gravity g, and the acceleration of the two blocks a.   What is the tension in the rope in newtons?

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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?”