A car must be driven a distance of 120.0 km in 2.5 h. During the first 1.5 h the average speed w

step 1 This question covers the concept of the speed. And let's say the total distance travel is AC and

A car must be driven a distance of 120.0 km in 2.5 h. During...

A car must be driven a distance of $120.0 \mathrm{km}$ in 2.5 h. During the first 1.5 h the average speed was $70 \mathrm{km} \mathrm{h}^{-1}$. What must the average speed for the remainder of the journey be?

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Key Concepts

Uniform Motion

Uniform motion refers to motion at a constant speed in a straight line. In problems involving uniform motion, the distance traveled is directly proportional to the time elapsed, making it straightforward to calculate one variable if the other two are known.

Average Speed

Average speed is the total distance traveled divided by the total time taken. It is a key concept in motion that allows one to determine how fast an object is moving overall, regardless of variations in instantaneous speed during different parts of the journey.

Time-Distance Relationship

The time-distance relationship is a fundamental aspect of kinematics, expressed by the equation distance = speed × time. This relationship is used to determine one of the variables when the other two are provided, and it is essential for solving problems that involve calculating distances covered over specified time intervals.

Segmented Journeys

Segmented journeys involve dividing a trip into separate parts, each with potentially different speeds or time intervals. This concept is important because it allows for the analysis of each segment individually, after which the results can be combined to understand the overall performance of the journey.

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