A car of mass 960 kg is free-wheeling down an incline at a constant speed of 9.0 m s–1.
The slope makes an angle of 15° with the horizontal.
Deduce that the average resistive force acting on the car is 2.4×103N

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1. This question is about the breaking distance of a car and specific heat capacity. (a) A car of mass 960 kg is free-wheeling down an incline at a constant speed of 9.0 m s–1. The slope makes an angle of 15° with the horizontal. (i) Deduce that the average resistive force acting on the car is 2.4×103N. ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... ........................................................................................................................... (2) (ii) Calculate the kinetic energy of the car. ........................................................................................................................... ........................................................................................................................... (1) (b) The driver now applies the brakes and the car comes to rest in 15 m. Use your answer to (a)(ii) to calculate the average braking force exerted on the car in coming to rest. ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... (2) (c) The same braking force is applied to each rear wheel of the car. The effective mass of each brake is 5.2 kg with a specific heat capacity of 900 J kg–1 K–1....



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