Answer
$44.1\ N$
Work Step by Step
For mass $m_{2}$, apply Newtons second law of motion so that:
$m_{2}(g) - T_1 = m_2(a)$
Since $a=0$;
$m_2 g= T_1$
$T_1 = (4.5\ kg)(9.8\ m/s^2)$
$T_1 = 44.1\ N$
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