# physics

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A freight train has a mass of 1.5 × 107 kg.
If the locomotive can exert a constant pull
of 4.9×105 N, how long does it take to increase
the speed of the train from rest to 74 km/h?

• physics -

F=ma

a=F/m

vf=at
t= vf/a=vf*m/Force

change vf to m/s, and you have it.

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