a car travel equal distances with velocity 60km/h,20km/h,10km/h ,find the magnitude of average velocity of the car over the whole journey
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Step-by-step explanation:
Let the distance travell by car=s
velocity of car in Ist case=60km/hr
in 2nd case= 20km/hr
in third case =10km/hr
time in Ist case=?
using formula
time=distance/speed
then
time=s/60hr
time in 2nd case=s/20hr
time in 3rd case=s/10hr
We know
average speed=total distance travell/total time taken
average speed =3s/[s/60+s/20+s/10]
=3s/[s+3s+6s/60
=3s/[10s/60]
=3(60/10)
=6×3km/hr
=18km/hr
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