(a)Find the useful power output (in W) of an elevator motor that lifts a2400kgload a height of40.0min12.0 s,if it also increases the speed from rest to 4.00 m/s.Note that the total mass of the counterbalanced system is 10,000 kgso that only2400kgis raised in height, but the full10,000 kgis accelerated. (Enter a number.)

(b)What does it cost (in cents), if electricity is $0.0900 per kWh? (Enter a number.)