An automobile is travelling along a straight road at a speed of 72km/h. The driver applies the brakes and brings the car to rest in 5s with uniform deceleration.
(i) Calculate the magnitude of the car’s deceleration.
(ii) Explain, with reference to inertia, what would happen to an unbelted passenger seated in the front when the brakes are applied.
(iii) Modern dashboards are made of soft, compressible material. How does this design reduce injuries in the situation described? Give the physical reason based on the concept involved in part (ii).