Calculate the magnitude of the normal force on a 15.2 kg block in the following circumstances. (Enter your answers in N.)   The block is resting on a level surface.   The block is resting on a surface tilted up at a 30.8° angle with respect to the horizontal.   The block is resting on the floor of an elevator that is accelerating upward at 5.03 m/s2.   The block is on a level surface and a force of 155 N is exerted on it at an angle of 30.8° below the horizontal.

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A: only three subpart at a time. please send part d again in new post. thank you

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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?”