A 4-kg projectile is fired vertically with an initial velocity of 9 m/s, reaches a maximum height, and falls to the ground. The aerodynamic drag D has a magnitude D = 0.0024 v2 where D and v are expressed in newtons and m/s, respectively. Knowing that the direction of the drag is always opposite to the direction of the velocity, determine (a) the maximum height of the trajectory, (b) the speed of the projectile when it reaches the ground.

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Q: please answer

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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?”