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4. A particle moves along x-axis with speed6 m/s for the first half distance of a journey and thesecond half distance with a speed 3 m/s. Theaverage speed in the total journey is(1) 5 m/s(2) 4.5 m/s(3) 4 m/s(4) 2 m/s

Answer»

Let the dist be 2x1st halfdist =xspeed is 6m/ss=d/tt=d/s=x/6

2nd halfdist xspeed is 3m/stime =d/s=x/3

average speed=total dist /total time=x+x/(x/6)+(x/3)=2x/3x/6=2x*6/3x=4m/s



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