What is the reading shown in spring balance?

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Solution

Force along rope is
$4 g - 4 g = 0$
Than
$a = 0$
$T - 4 g = 0$
$T = 40 N$
Then reading is $40 N$

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What is the reading shown in spring balance?

Force along rope is 4g−4g=0Thana=0T−4g=0T=40NThen reading is 40N

Force along rope is
$4 g - 4 g = 0$
Than
$a = 0$
$T - 4 g = 0$
$T = 40 N$
Then reading is $40 N$