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[" 11.A train accelerating uniformly fro...

[" 11.A train accelerating uniformly from rest attains a maximum "],[" speed of "40ms^(-1)" in "20s" .It travels at this speed for "20s" and "],[" is brought to rest uniform retardation in further "40s" .What is "],[" the average velocity during this period? "],[[" (a) "80/3ms^(-1)" (b) "40ms^(-1)," (c) "25ms^(-1)," (d) "30ms^(-1)]]

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