Question

A particle moves along x-axis with speed 20 metre per second for the first half distance of a journey and the second hand distance is speed Earth 3 metre per second.t he average speed in the total journey is

Answer 1

lets the total distance=x
so half distance=x/2
and its velocity=20 m/s
so, time=x/2×20=x/40 min
again, time=x/2×3=x/6 min
avg. speed=x/(x/40)+(x/6)
=x/(x+5x/40)
=40x/x+5x
=40/5+1
=40/6=5 m/s ans.
dont give me brainleist ...thanks is enough.