Question

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​

Answer 1

Answer:

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Answer 2

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