The apparent weight of a man in moving
lift is less than his real weight when it is going down with ________.
चलती लिफ्ट में एक आदमी का स्पष्ट वजन उसके वास्तविक वजन से कम होता है जब वह ________ के साथ नीचे जा रही होती है।
uniform speed
an acceleration
some linear momentum
retardation
an acceleration
We know that, real weight (W) = mg
Consider following cases of apparent
weight of a man in moving downward,
(i) Moving with acceleration (w') = mg-ma = m (g - a) <mg
(ii) Moving with uniform speed
(iii) Moving with retardation (w') = mg-m(-a )= m (g+a) > mg
It is clear that apparent weight of is
less than his real weight in case (i), when the lift is going down with an
acceleration.
Hence, the correct option is (B).
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