# physics

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A freight train has a mass of 6.5 107 kg. If the locomotive can exert a constant pull of 11.5 105 N, how long would it take to increase the speed of the train from rest to 85 km/h?
s

• physics -

netforce= totalmass*acceleration

find acceleration
then
vf=vi+at solve for t.

(change km/hr to m/s)

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