$(6/106)$ If the effective coefficient of friction at the railing is $=0\mathrm{.}20.($a$)$ determine the tension T which the shipworkers must develop in the cable to lower the $100-$kg crate at a slow steady speed. $($b$)$ What would be the value of T in order to raise the crate? $($c$)$ Are these reasonable forces for two workers to apply? Provide evidence to support your argument. $($ANS T $=717$ N$,$ T $=1340$ N$)$