0 7. 3 Figure 10 shows a circuit with a switch connected incorrectly. Figure 10 A Explain how closing the switch would affect the current in the variable resistor. [2 marks]0 8 Figure 11 shows a toy car in different positions on a racing track. Figure 11 A Racing track C Loop Toy car D B 0 1.1 The toy car and racing track can be modelled as a closed system. Why can the toy car and racing track be considered 'a closed system'? [1 mark] Tick () one box. The racing track and the car both have gravitational potential energy. The racing track and the car are always in contact with each other. The total energy of the racing track and the car is constant.Dor out 0 8 2 The car is released from rest at position A and accelerates due to gravity down the track to position B. mass of toy car = 0.040 kg vertical height between position A and position B = 90 cm gravitational field strength = 9.8 N/kg Calculate the maximum possible speed of the toy car when it reaches position B. [5 marks] Speed = m/sA Racing track C Loop Toy car D B 0 8. 3 At position C the car's gravitational potential energy is 0.20 J greater than at position B. How much kinetic energy does the car need at position B to complete the loop of the track? Give a reason for your answer. [2 marks] Tick ( ) one box. Less than 0.20 J Exactly 0.20 J More than 0.20 J Reason 8