Posted by **monica** on Wednesday, January 5, 2011 at 6:43pm.

A freight train has a mass of 1.8 × 10

7

kg.

If the locomotive can exert a constant pull

of 6.2×10

5

N, how long does it take to increase

the speed of the train from rest to 70 km/h?

Answer in units of min.

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