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A freight train has a mass of 1.2 ✕ 107 kg. If the locomotive can exert...

A freight train has a mass of 1.2 ✕ 107 kg. If the locomotive can exert a constant pull of 6.5 ✕ 105 N, how long does it take to increase the speed of the train from rest to 78 km/h?
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