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For moving train velocity-time graph is ...

For moving train velocity-time graph is shown in the figure :

(1) What is the maximum speed of the train and how long it is maintained ?
(ii) What are the accelerations of the train in OA, AB and BC parts ? (ii) Find total distance travelled by the train.

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`(i) 10 ms ^(-1) , ` till 380 s
(ii)` 0.25 ms ^(-2) , 0 ms ^(-2) , - 0.125 ms ^(-2)`
`(iii) 4.4 km`
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