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## Homework Statement

A freight train has a mass of 1.4x10

^{7}kg. If the locomotive can exert a constant pull of 6.7x10

^{5}N, how long does it take to increase the speed of the train from rest to 84 km/h?

## Homework Equations

F=ma

a=v/t

## The Attempt at a Solution

I converted 84 km/h into 23.3 m/s.

F=ma

6.7x10^5 N=1.4x10^7 m (a)

a= .047 m/s^2

a=v/t

.047 m/s^2=(23.3 m/s)/t

t=495.7s --> 2.97x10^4 min

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