1.

A body covers half the distance with a speed of 20m/s the other half with a speed of 30m/s. The average velocity ogf the body during the whole journey is

Answer»

zero
24m/s
( 25 m/s
NONE of these

Solution :`t_(1)=(S)/(U), "where" u=20m/s`
`t_(2) = (S)/(u), "where" v=30m/s`
`:. "Average VELOCITY" = (2S)/(t_(1)+t_(2))`
`=(2S)/((S)/(u)+(S)/(v))=(2uv)/(u+v)`
`=(2xx20xx30)/(20+30)` = 24m/s


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