motion of the car starting from the instant the driver spots – Discussion Forum

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Kriti

Asked: September 14, 2026In: Class 9 Science

A 1000 kg car is moving along a road at a constant speed. Suddenly, the driver notices some obstruction ahead and applies the brakes to come to a complete stop. The graphical representation of motion of the car starting from the instant the driver spots the traffic ahead is shown in Fig. 7.38. (i) Describe how the car moves between positions A and B. (ii) Calculate the kinetic energy of the car at A. (iii) State the work done by the brakes in bringing the car to a halt between B and C. (iv) What does the kinetic energy of the car transform into?

From Fig. 7.38, the car maintains a steady speed of 35 m s-1 between A and B. Kinetic energy at A is 612500 J. Braking from B to C performs minus 612500 J of work, generating heat and sound.