10. A moving train is brought to rest within
20 seconds by applying brakes. If the
retardation due to brakes is 2 m/s2, then the
initial velocity was,
(a) 10 m/s
(b) 20 m/s
(c) 30 m/s
(d) 40 m/s
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dude the answer is 40m/s
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