A Lamp of Mass M Hangs from a Spring Scale

question 91

Multiple Choice

A lamp of mass m hangs from a spring scale that is attached to the ceiling of an elevator.When the elevator is stopped at the fortieth floor,the scale reads mg.What does it read as the elevator slows down to stop at the forty-fifth floor?

• A)more than mg
• B)less than mg
• C)mg
• D)zero
• E)One cannot tell without knowing how fast the elevator is stopping.

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