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Question 10: A body will be weightless when the elevator falls down just like a free falling body. Explain.

ANSWER

Consider a body in an elevator moving down with some acceleration, say . The tension in the string ‘T’ is given by,
T =mg – ma

When the body is falling freely, then, a = g, the acceleration due to gravity.
Substituting a = g in the above equation,
T = mg – mg = 0

Tension ‘T’ read by the scale, gives the apparent weight of the body. Therefore, the apparent weight of the body will be zero. Hence, a body becomes weightless when the elevator falls freely under the action of gravitational force.

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