Question

A driver of a car travelling at \(52\) \(km \;h^{–1}\) applies the brakes Shade the area on the graph that represents the distance travelled by the car during the period. 
Which part of the graph represents uniform motion of the car?

Answer 1

 

Braking Distance and Uniform Motion - Graph Interpretation 

A car is travelling at a speed of \( 52 \; \text{km h}^{-1} \) when the driver applies the brakes.

1. Area Representing Distance Travelled During Braking

On a velocity-time graph, the area under the graph represents the distance travelled. When brakes are applied, the velocity starts decreasing with time until it becomes zero.

The shaded region under the velocity-time curve, from the moment brakes are applied until the car comes to rest, represents the distance travelled during deceleration (braking).

2. Part Representing Uniform Motion

On the velocity-time graph, the car travels with uniform motion as long as the velocity remains constant. This is represented by the horizontal line segment on the graph before the brakes are applied.

Hence, the horizontal segment of the graph (with constant velocity \( 52 \; \text{km h}^{-1} \)) represents the uniform motion of the car.