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  4. A 40 kg boy stands on a spring scale in a lift. At an instant, it is detected that the reading reduces to 30 kg for a while and then returns to original value. It can be said that

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Q. A 40 kg boy stands on a spring scale in a lift. At an instant, it is detected that the reading reduces to 30 kg for a while and then returns to original value. It can be said that

Laws of Motion

Solution:

During accelerated downward motion the apparent weight becomes m (g - a) i.e. reduced. If the lift stops the apparent weight will become equal to actual weight.