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Question

A decoration, of mass M, is suspended by a string from the ceiling inside an elevator. The elevator is traveling upward at a constant speed. The tension in the string is

A
Equal to Mg
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B
Less than Mg
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C
Greater than Mg
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D
Impossible to tell without knowing the speed
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Solution

The correct option is C Equal to MgHere, the elevator is moving upward with a constant speed, that means acceleration due to gravity is acceleration present.Due to gravity, a downward force is acting downwards, F=mg.From figure,T=mgwhere T is the tension of the string.

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