Posted by **jena** on Sunday, January 9, 2011 at 5:38pm.

A freight train has a mass of 3.2 × 107 kg.

If the locomotive can exert a constant pull

of 7.1 × 105 N, how long would it take to

increase the speed of the train from rest to

74.6 km/h? (Disregard friction.)

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