Question

Does acceleration due to gravity act downwards in the case of a lift

Answer 1

When a object freely fall from the top of a building or anything else then it produces acceleration but a lift is not with the contact with gravity it is an electrically machine and mechanical force is used .

Answer 2

Answer:initial velocity of box , u = 0

Let final velocity of box is v

it is given that constant horizontal force , f = mg/2

coefficient of friction varies with x as  

when body moves right direction due to constant horizontal force, friction acts just opposite direction. e.g., left direction.

so, net force acts body body at any instant is given by  

we know, from Newton's 2nd law,

so,  

here N is normal reaction act on box,

so, N = mg

initial velocity of box , u = 0

Let final velocity of box is v

it is given that constant horizontal force , f = mg/2

coefficient of friction varies with x as  

when body moves right direction due to constant horizontal force, friction acts just opposite direction. e.g., left direction.

so, net force acts body body at any instant is given by  

we know, from Newton's 2nd law,

so,  

here N is normal reaction act on box,

so, N = mg

[v² - u² ] = gx - gx²

u = 0, so, v² = gx - gx²

body comes to rest when , v = 0

so, x =

[v² - u² ] = gx - gx²

u = 0, so, v² = gx - gx²

body comes to rest when , v = 0

so, x =

Explanation: