Posted by **John** on Wednesday, November 7, 2012 at 6:50pm.

A freight train has a mass of 1.7 × 10^7 kg.

If the locomotive can exert a constant pull

of 5.2 × 10^5 N, how long would it take to

increase the speed of the train from rest to

74.6 km/h? Disregard friction.

Answer in units of s

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