Study the following real-life safety arrangements and answer the questions that follow.
a. (i) What is meant by “inertia of motion”?
b. (ii) Airbags in a car inflate during a collision. Explain how an airbag minimises injury to the driver by referring to inertia.
c. (iii) A cyclist is advised to wear a helmet even at low speeds. Using the idea of inertia of rest and of motion, justify this advice.