Shweta is driving her car on a straight highway from City A to City B, which are 150 km apart. She starts his journey at 9:00 AM. For the first 50 km, she drives at 60 km/h. For the next 50 km, due to road repairs, she drives at 40 km/h. For the last 50 km, the road clears and he speeds up to 75 km/h. Meanwhile, her friend Aruna starts from City B toward City A at 10:00 AM, driving at a constant speed of 60 km/h on the same road.

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CASE_STUDIESAverage Speed and Instantaneous SpeedRelative Velocity in One Dimension4 sub-questions

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When an object is in motion, its position changes with time. So, the quantity that describes how fast is the position changing w.r.t. time and in what direction is given by average velocity. It is defined as the change in position or displacement (Δx) divided by the time interval (Δt) in which that displacement occurs. However, the quantity used to describe the rate of motion over the actual path, is average speed. It defined as the total distance travelled by the object divided by the total time taken.

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A car travels from A to B at a speed of 20 Km/hr and returns at a speed of 30 Km/hr the average speed of the car for the whole journey is

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