A body travel a distance of 10 km with constant speed of 30 km/h and then the next 40 km at a constant speed of 50 km/h . Find the average speed for the whole journey.
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Given :
▪ A body travels a distance of 10km at a constant speed of 30kmph.
▪ Then the 40km at a constant speed of 50kmph.
To Find :
▪ Average speed of body.
Concept :
☞ Average speed is defined as the ratio of total distance travelled to the total time taken.
☞ It is a scalar quantity.
☞ It has only magnitude.
☞ It can't be negative or zero.
☞ SI unit : m/s
Calculation :
→ Vav = (d1+d2)/(t1+t2)
→ Vav = (d1+d2)/[(d1/V1+d2/V2)]
→ Vav = (10+40)/[(10/30)+(40/50)]
→ Vav = 50/(0.33+0.8) = 50/1.13
→ Vav = 44.24kmph
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