, Question 1 (Mechanics)
(a) A car accelerates uniformly from rest to a speed of 25 m s⁻¹ in 12 s.
(i) Calculate the acceleration of the car.
[2 marks]
(ii) Calculate the distance travelled during this 12 s period.
[2 marks]
(b) The car then continues at a constant speed of 25 m s⁻¹ for another 8 s. The brakes are then applied,
causing a constant deceleration of 4.5 m s⁻² until the car stops.
(i) How much time does it take to stop from the moment the brakes are applied?
[2 marks]
(ii) Sketch a velocity-time graph for the whole journey. Label the axes with appropriate values.
[3 marks]
(iii) Use your graph to find the total distance travelled.
[2 marks]
Turn over for Question 2
Question 2 (Electricity)
(a) State the relationship between current, potential difference and resistance for an ohmic conductor.
[1 mark]
(b) A piece of resistance wire of length 0.85 m has a resistance of 12 Ω. The wire has a circular
cross-section of diameter 0.28 mm.
(a) A car accelerates uniformly from rest to a speed of 25 m s⁻¹ in 12 s.
(i) Calculate the acceleration of the car.
[2 marks]
(ii) Calculate the distance travelled during this 12 s period.
[2 marks]
(b) The car then continues at a constant speed of 25 m s⁻¹ for another 8 s. The brakes are then applied,
causing a constant deceleration of 4.5 m s⁻² until the car stops.
(i) How much time does it take to stop from the moment the brakes are applied?
[2 marks]
(ii) Sketch a velocity-time graph for the whole journey. Label the axes with appropriate values.
[3 marks]
(iii) Use your graph to find the total distance travelled.
[2 marks]
Turn over for Question 2
Question 2 (Electricity)
(a) State the relationship between current, potential difference and resistance for an ohmic conductor.
[1 mark]
(b) A piece of resistance wire of length 0.85 m has a resistance of 12 Ω. The wire has a circular
cross-section of diameter 0.28 mm.
