Posted by **Michael** on Monday, January 10, 2011 at 9:59am.

A freight train has a mass of 1.2 × 107 kg. If the locomotive can exert a constant pull of 5.0 × 105 N, how long would it take to increase the speed of the train from rest to

89.2 km/h? (Disregard friction.) Answer in units of s.

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