A train accelerating uniormly from rest ...

A train accelerating uniormly from rest attains a maximum speed of `40ms^(-1)` in `20s`. It travels at this speed for `20s` and is brought to rest with uniform retardation i further `40s`. What is the average velocity during this period?

80 m/s

25 m/s

40m/s

30m/s

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