A car with non-uniform motion travels 100 km in 4 hours. What can be said about the speed of the car?

(a) Its speed is constant at 25 km/h during the journey.
(b) Its average speed is 25 km/h during the journey.
(c) Its speed is 25 km/h at the beginning and end of the journey and varies in between.
(d) Its speed is 25 km/h for most of the journey.

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Solution

(b) Its average speed is 25 km/h during the journey.

Average speed of the car = $\frac{Total distance travelled}{Total time taken} = \frac{100}{4} = 25 km / h$

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(b) Its average speed is 25 km/h during the journey. Average speed of the car = Total distance travelledTotal time taken=1004=25 km/h

(b) Its average speed is 25 km/h during the journey.

Average speed of the car = $\frac{Total distance travelled}{Total time taken} = \frac{100}{4} = 25 km / h$