A 55 kg block is hanging vertically from a massless string in an elevator. (a) If the elevator is not moving, what is the tension in the string (in Newtons)? (b) If the elevator accelerates upwards at 2.5 m/s2, what is the tension? (c) If the elevator accelerates downwards at 2.5 m/s2, what is the tension?

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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: