Question

If the lift is moving upwards with a uniform velocity then the frictional resistance offered by the body is(assume the assume of body as m)

• A. $mg$
• B. $\mu mg$
• C. $2mg$
• D. $0$

Answer 1

The correct option is B $\mu mg$

For motion of the lift with uniform velocity,
$R=mg$, because the acceleration is zero.
The frictional force acts opposite to the direction hence μR = μmg
or frictional resistance = μmg