A 2.0 kg projectile with initial velocity v→ = 6.5 ı^ m/s experiences the variable force  F→ =-2.0t ı^ + 4.0t^2 ȷ^ N, where t is in s. What is the projectile's speed at t = 2.0 s? At what instant of time is the projectile moving parallel to the y-axis?

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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?”