Question

A body of mass 2 kg is hung on a spring balance mounted vertically in a lift. If the lift descends with an acceleration equal to the acceleration due to gravity ‘g’, the reading on the spring balance will be

• A. $2kg$
• B. $Zero$
• C. $4kg$
• D. $2kg$

Answer 1

The correct option is B $Zero$

Reading on the spring balance = Apparant weight of the body = $m(g–a)$ = 0 (since $a=g$)
$\therefore$ Force = 0