Q.

The apparent weight of a person inside a lift is W1 when lift moves up with a certain acceleration and is W2 when lift moves down with same acceleration. The weight of the person when lift moves up with constant speed is

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a

W1W22

b

2W2

c

W1+W22

d

2W1

answer is A.

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Detailed Solution

Lift is going up with acceleration ‘a’ :

W1=m(g+a) ________  (1)

Lift is going down with acceleration ‘a’ :

 W2=m(ga)  ________ (2)

(1) + (2)  

mg=W1+W22        

mg is the weight of the person (mg) =W1+W22

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