<p>If the maximum load carried by an elevator is 1400 kg (600 kg-passengers + 800 kg - elevator), which&nbsp;is moving up with a uniform speed of 3&nbsp;<span class="equation">\(m s^{-1}\)</span>&nbsp;and the frictional force acting on it is 2000 N , then the maximum power used by the motor is________kW (g = 10 <span class="equation">\(m/s^2\)</span>)​​​​​​​​​​​​​​</p>