Register to reply 
A freight train has a mass of 4.5*10^7 kg 
Share this thread: 
#1
Oct1606, 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 


#2
Oct1606, 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?



#3
Oct1706, 12:29 PM

P: 179

Also remember to use the correct units, i.e. don't use km/hr.



Register to reply 
Related Discussions  
Einstein's train  When+where does side observer see lightnings to the train rider?  Special & General Relativity  7  
Freight Car Collision  Introductory Physics Homework  1  
Freight elevator efficiency?  Mechanical Engineering  2  
Need help w/ Acceleration of a Freight Train problem  Introductory Physics Homework  1  
Freight car velocity  Introductory Physics Homework  3 