Q4. Electric Vehicle (EV) (25 points) A Chevrolet EV has the power consumption of 51kWh for the ideal mileage up to 150km. In fact, its efficiency is 95%. The batteries have to be replaced for the mileage up to 160,000km, which costs 45,000 HKD. a) How much will the EV cost actually when driving 160.000 kilometers. b) Assume the speed of the EV is 60 kmh. The diameter of the tire is 60 cm. The output power of the electric machine is 50 kW. It is connected to a reduction gear whose gear ratio is 6:1. If the EV moves linearly with the constant speed, please calculate the rotary speed of the electric machine and traction force of the EV. Q4. Electric Vehicle (EV) (25 points) A Chevrolet EV has the power consumption of 51kWh for the ideal mileage up to 150km. In fact, its efficiency is 95%. The batteries have to be replaced for the mileage up to 160,000km, which costs 45,000 HKD. a) How much will the EV cost actually when driving 160.000 kilometers. b) Assume the speed of the EV is 60 kmh. The diameter of the tire is 60 cm. The output power of the electric machine is 50 kW. It is connected to a reduction gear whose gear ratio is 6:1. If the EV moves linearly with the constant speed, please calculate the rotary speed of the electric machine and traction force of the EV