# M1 help

Watch
Announcements
#1
A train is timed between successive posts A, B and C, each 2000 m apart. It takes 100 seconds to travel from A to B and 150 seconds to travel from B to C. The ******ation throughout the journey is uniform.
The magnitude of the ******ation is...
Okay so i know you have to set up simultaneous equations but I dont understand why you use the equation s=vt-1/2at^2 for a to b and s=ut+1/2at^2 for b to c. why are we using the final velocity for the first part and the inital velocity for the second part. please explain. Thank you.
0
#2
0
3 years ago
#3
(Original post by mk_cbc)
A train is timed between successive posts A, B and C, each 2000 m apart. It takes 100 seconds to travel from A to B and 150 seconds to travel from B to C. The ******ation throughout the journey is uniform.
The magnitude of the ******ation is...
Okay so i know you have to set up simultaneous equations but I dont understand why you use the equation s=vt-1/2at^2 for a to b and s=ut+1/2at^2 for b to c. why are we using the final velocity for the first part and the inital velocity for the second part. please explain. Thank you.
The final velocity for the first part is equal to the initial velocity for the second part. So you can form two equations; the first one in v and the second one in u. Make v or u the subject of each equation, then set the other sides (the ones with a) equal to each other since you know v and u are the same.
0
7 months ago
#4
A train is timed between successive posts A, B and C, each 2000 m apart. It takes 100 seconds to travel from A to B and 150 seconds to travel from B to C. The acceleration throughout the journey is uniform.What is the acceleration?
0
7 months ago
#5
A train is timed between successive posts A, B and C, each 2000 m apart. It takes 100 seconds to travel from A to B and 150 seconds to travel from B to C. The acceleration throughout the journey is uniform.

0
7 months ago
#6
A train is timed between successive posts A, B and C, each 2000 m apart. It takes 100 seconds to travel from A to B and 150 seconds to travel from B to C. The acceleration throughout the journey is uniform.

Find the velocity of the train at B.
0
7 months ago
#7
(Original post by mk_cbc)
A train is timed between successive posts A, B and C, each 2000 m apart. It takes 100 seconds to travel from A to B and 150 seconds to travel from B to C. The ******ation throughout the journey is uniform.
The magnitude of the ******ation is...
Okay so i know you have to set up simultaneous equations but I dont understand why you use the equation s=vt-1/2at^2 for a to b and s=ut+1/2at^2 for b to c. why are we using the final velocity for the first part and the inital velocity for the second part. please explain. Thank you.
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### Should there be a new university admissions system that ditches predicted grades?

No, I think predicted grades should still be used to make offers (637)
33.44%
Yes, I like the idea of applying to uni after I received my grades (PQA) (805)
42.26%
Yes, I like the idea of receiving offers only after I receive my grades (PQO) (377)
19.79%
I think there is a better option than the ones suggested (let us know in the thread!) (86)
4.51%