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A motor cyclist accelerate from rest wit...

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`

Text Solution

Verified by Experts

The correct Answer is:
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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