Question

A man of mass 60 kg is standing on a spring balance inside a lift. lf the lift falls freely downwards, then the reading of the spring balance will be

• A. zero
• B. 60 kgf
• C. < 60 kgf
• D.

  60 kgf

Answer 1

Answer: (A)

zero

Answer 2

When lift falls freely downward, then
$\, \, \, \, \, \, \, \,$ mg - R = ma
Here, $\, \, \, \, \, \,$ a =g
$\therefore \, \, \, \, \, \, \, \,$ R =0
Hence, reading of spring balance is zero.