1.

A motor cyclist accelerate from rest with acceleration of `2 m//s^(2)` for a time of `10 sec`. Then he moves with a constant velocity for `20 sec` and then finally comes to rest with a deceleration of `1 m//s^(2)`. Average speed for complete journey is `:-`A. `10 m//s`B. `14 m//s`C. `20m//s`D. `28 m//s`

Answer» Correct Answer - B
`V_(2v)=((1)/(2)2(10)^(2)+20xx20+(20)^(2)/(2xx1))/(10+20+20)`
`=(100+400+200)/(50)=14 m//s`


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