A car travels 100km with the speed of 50 km/h and another 200 km with the speed of 20 km/h. The average speed of the car is ___ km/h
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Answer:
As the speed does not remain constant throughout the journey, the motion is not uniform.
From relation v=dt
t = d/v
The journey of the car can be considered in two parts.
In the first part of journey,
distance d1 = 100 km, speed v1=50kmh−1
t1=d1v1=100km50kmh−1=2h
In the second part of journey,
distance d2 = 200 km, speed v2=20kmh−1
Time taken t2=d2v2=200km20kmh−1=10h
Total distance travelled d=d1+d2
= 100 km + 200 km = 300 km
Total time of travel t=t1+t2
= 2 h + 10 h = 12 h
Average speed = Total distance travelled Total time of travel
Explanation:
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