An elevator has a mass of $1000kg$ is carrying passengers having a combined mass of $1000kg.$ A constant friction force of $5000N$ acts on the elevator. What power delivered by the motor is required to lift the elevator upward at a constant acceleration of $2\mathrm{.}5\frac{m}{s^2}$ at a moment the speed of the elevator $2\frac{m}{s}?$

A$)60$kwatt

B$)25$kwatt

C$)30$kwatt

D$)50$kwatt

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