A train with a length of L=1050m moves u...

A train with a length of L=1050m moves uniformly on the horizontal section of rail road.However the train encounters a small hill that slopes gently.With what minimum speed v (in m/s ) can the train cross the hill? The base of hill has a length l=100m the lengths of the slope are l_(1)=80m and l_(2)=60m .The slope of hills can be consider as straight lines and the small section of rounding at the top of the hill can be ignored.Neglect air drag.(take g=10m/s^(2) ).

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