# Question #97217

$1 k g w t$ is the weight of a mass of $1 k g$ and is equal to $9.81 N$ according to $w = m g$, where $w$ is weight, $m$ is mass and $g$ is acceleration due to gravity.
The spring balance has graduations in $0.5 k g w t$ which is equal to $\left(9.81 \cdot 0.5\right) = 4.91 N$
The block starts moving when the pointer is at the $25 t h$ division, which is equal to $\left(4.91 \cdot 25\right) = 122.6 N$ correct to 1 decimal place.