The vertical component of the acceleration of a sailplane is zero when the air pushes up against its wings with a lift force of 4.00 kN. a. Assume that the only forces on the sailplane are that due to gravity and that due to the air pushing up against its wings. What will be the gravitational force on Earth due to the sailplane? If the force acting is in upward direction, enter a positive value and if the force acting is in downward direction, enter a negative value. (answer in kN) b. If the wing stalls and the upward force decreases to 1.71 kN, what is the acceleration of the sailplane? If the acceleration is upward, enter a positive value and if the acceleration is downward, enter a negative value answer in m/s^2

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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?”