A 60-kg square and a 90-kg square box was thrown out from an airplane at an altitude of 6000 m, both falling in the flat position. The surface dimension of the boxes are 2 meter by 2 meter in flat position. Calculate their terminal velocities. How long will it take for each box to reach the ground (assuming the time to reach terminal velocity is small)? Assume all values are accurate to three significant digits

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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?”