Question

the apparent weight of mass in a lift moving up is 80kg when its weight in the stationary lift is 60kg . if the same lift now moves up with same retardation, the weight of the mass will be

Answer 1

Heya user !!!

Here's the answer you are looking for

⏩When a lift moves up with an acceleration a, then weight of any object inside it becomes m(g+a)

So, here

⏩m(g+a) = 80 

and 

⏩mg = 60

So, m = 6 as g = 10

so, m(g+a)=80

6(10+a) = 80

10 + a = 40/3

⏩a = 10/3 m/s²

⏩Now the acceleration becomes retardation, so a = –10/3m/s²

W = 6 {10 + (-10/3)}

W = 6(10-10/3)

W = 6(20/3) = 40N

Since weight is 40N, mass becomes 40/10 = 4kg


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Answer 2

Answer:

it is the solution of above question