Which way and by what angle does the accelerometer in figure deflect under the following conditions? The cart is moving toward the right with speed increasing at 2.0 m/s2. (Express your answer in degrees. Enter positive value if the accelerometer deflects to the left of vertical and negative if it deflects to the right.) The cart is moving toward the left with speed decreasing at 4.5 m/s2. (Express your answer in degrees. Enter positive value if the accelerometer deflects to the left of vertical and negative if it deflects to the right.) The cart is moving toward the left with a constant speed of 4.0 m/s. (Express your answer in degrees. Enter positive value if the accelerometer deflects to the left of vertical and negative if it deflects to the right.)

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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?”