Fig. 2.2 shows a rider on an electric scooter. [Figure 2.2] The scooter contains a battery and a motor to drive the back wheel.

1. (a)(i)State the name of the energy store in the battery.[1]
2. (a)(ii)Describe, in terms of work done, the stages of energy transfer from the energy store in the battery to the kinetic energy of the scooter.[2]
3. (b)The total mass of the scooter and the rider is 70kg. Calculate the total kinetic energy of the rider and scooter when the scooter has a speed of 4.0m/s. kinetic energy = ................................................. J[2]
4. (c)(i)The battery is marked 'energy capacity 0.35 kilowatt-hour (kWh)'. Define what is meant by a kilowatt-hour.[1]
5. (c)(ii)The scooter stops working because the battery is totally discharged (flat). This means that there is no more energy stored in the battery. The battery is then recharged using a 70W power supply. Calculate the time taken to fully recharge the battery. time = ................................................. hours[2]

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