A rubber stopper is suspended from the handrail of a subway car traveling directly westwards. As the subway train nears a station, it begins to slow down, causing the stopper and string to hang at an angle of 13.5 degrees from the vertical. Find the acceleration of the train? Include a force diagram.

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: