$14-51.$ The $1000-$lb elevator is hoisted by the pulley system and motor $\backslash ($ M $\backslash ).$ If the motor exerts a constant force of $500$ lb on the cable, determine the power that must be supplied to the motor at the instant the load has been hoisted $\backslash ($ s$=15\backslash$mathrm$\{$ft$\}\backslash )$ starting from rest. The motor has an efficiency of $\backslash (\backslash$varepsilon$=0\mathrm{.}65\backslash ).$

Problem $14-51$