Train Braking Distance Calculation

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Homework Help Overview

The discussion revolves around kinematics problems involving the calculation of braking distance for a train and the acceleration of a particle moving along a straight line. Participants are exploring the application of equations of motion under constant acceleration.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants discuss the application of kinematic equations for displacement and acceleration. Some question the initial conditions and relationships between variables, while others suggest breaking problems into parts to analyze them more effectively.

Discussion Status

Some participants have expressed that they have reached conclusions on their own, while others are still exploring the necessary relationships and equations. There is an ongoing exchange of ideas and attempts to clarify the problems presented.

Contextual Notes

Participants mention specific values and conditions, such as initial velocities and distances, but there is a lack of consensus on the methods to approach the problems. The discussions reflect a learning process with varying degrees of understanding among participants.

CathyLou
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Hi.

I would really appreciate it if someone could please help me with the following M1 level kinematics question as I am really stuck.

The brakes of a train can produce a retardation of 1.7 m/s^2. If the train is traveling at 100 km/h and applies its brakes what distance does it travel before stopping?

I got that:

a = -1.7
u = 22.8 (when converted to m/s)
s = ?

but I do not know where to go from here.

Thank you.

Cathy
 
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Have you studied the different equations for displacement with constant acceleration?
 
learningphysics said:
Have you studied the different equations for displacement with constant acceleration?

Just realized that v = 0!

I have got the answer now! :smile:

Cathy
 
Hi.

Could someone please help me with the following question? I have no idea how to even start it.

A particle is moving along a straight line. It passes points A, B and C on the line t = 0, t = 3 s and t = 6 s respectively. If AC is 60 m and the velocity of the particle at A is 4 m/s find the acceleration of the particle (assumed uniform) and the distance AB.

Thank you.

Cathy
 
Break this problem into parts. You know that from A to C 60m; [tex]v_0=4m/s[/tex] and [tex]t=6s[/tex]
so you have t, v, and displacement. Do you know of any relationship between those variables?

Casey
 
Thank you so much for your help. I have figured out the answers now. :smile:

Cathy
 
Nice.
 

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