Question $[5]$: The double pulley has a mass of $15$ kg and a radius of gyration of $ko=110mm.$ If the block A has a mass of $40$ kg $,$ use impluse and momentum, determine the speed of the block A in $3$ s after a constant force of $2$ kN is applied to the rope wrapped around the inner hub of the pulley. The block A is originally at rest. $[25$ marks$])=(9\mathrm{.}81\frac{m}{s^2}$