When a truck moves along a curvature ,radius=50.0 m, on a horizontal ground with a speed  V=30.0 mile/hour, the string of a simple pendulum (a light string connected to a ball of mass m)  that fixed on the ceiling of the truck holds an angle θ with respect to vertical.  1) draw a free body diagram of the ball. 2) find the angle θ and tension on the string

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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?”