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A freight train has a mass of 4.5*10^7 kg

by Fanjoni
Tags: freight, mass, train
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Fanjoni
#1
Oct16-06, 10:55 PM
P: 11
A freight train has a mass of 4.5*10^7 kg. If the locomotive can exert a constant pull of 15*10^5 N, how long would it take to increase the speed of the train from rest to 85 km/h?

I know u need to use F=ma but how do i find time
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gunblaze
#2
Oct16-06, 10:59 PM
P: 186
Think! What are you trying to find by using F=ma? Clue: You do need to use a little kinematics in this qn. If u have acceleration, final velocity and initial velocity, how are you goin to find time?
civil_dude
#3
Oct17-06, 12:29 PM
P: 179
Also remember to use the correct units, i.e. don't use km/hr.


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