Question

Q.72
A lift is moving downward with an acceleration of
3 m/s2 and g=9.8 m/s2. To carry a bag of mass 5 kg
in his hands a man in the lift has to exert a force of-
(1) 15 N
(2)49 N
(3) 34 N
(4) 64 N​

Answer 1

Answer :

Option (3) - 34N

Explanation:

Normal force : N

Acc. to ques , N-mg = ma

N = m(a+g)

Note : acceleration is -ve i.e. -3m/s²

N = 5(-3+9.8) = 34N

Apparent weight = N = 34N

Answer 2

Answer:

upper answer s correct