A body of mass 2 , kg is hung on a spring balance mounted vertica… - Vidyadip

MCQ

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 $‘g’$, if the lift moves up with an acceleration equal to the acceleration due to gravity, the reading on the spring balance will be .......... $kg$

A
$2$
B
$(2 \times g)$
C
$(4 \times g)$
✓
$4$

✓

Answer

Correct option: D.

$4$

d
(d) When lift moves upward then reading of the spring balance,

$R = m(g + a) = 2(g + g) = 4g\;N = 4\;kg$ [As $a = g$]

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