- #1
gary32
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Homework Statement
A train of 80tonnes moves at a velocity of 70km/hr up to the bottom of a gradient of 8degrees
The power is turned off and the train allowed to coast up the gradient before coming to rest,
If the tractive resistance to motion is 70Newtons per tonne, calculate the distance moved by the train up the gradient before coming to rest.
Homework Equations
Acceleration = Final velocity - initial velocity?
Force = Mass x acceleration
s=(u+v/2)t
The Attempt at a Solution
I have calculated the following to start with;
Train mass = 80000kg
Velocity = 19.4m/s
tractive resistance = 0.07Newtons per kg
The problem again is not having a clue what formula(s) to use in which order etc
I tried To use F=MA to calculate force then minus the tractive resistance
then convert back to acceleration which i then get 19.33m/s, but that doesn't seem right at all
Any ideas?
Thanks,