A car travels 100 km with a speed of 50 km/h, and another 200 km with a speed of 20 km/h. Is the motion uniform? Find the average speed of the car.
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Total time for the journey, t=100/45=20/9 hrs
Time for first 50 km, t
1
=50/30=5/3 hr
So, time for remaining journey, t
2
=20/9−5/3=5/9 hrs
Speed for remaining journey v
2
=
5/9
50
=90 km/h
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