Question

Plz...Answer this question ​

Answer 1

u1=10m/s

U2=20m/s.

u3=60m/s

distance=s/3

time(1)=distance /speed=s/3×10=s/30

next, distance=s/3

time(2)=s/3×20=s/60

time (3)=s/180

average speed =total distance/total time =s/3 + s/3 + s/3/(s/30 + s/60 + s/180)

=s/(6s+3s +s)/180

=180s(10s)=18m/s