mk_cbc
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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.
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mk_cbc
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please help
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Dysf(x)al
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(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.
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elliecoonan
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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?
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elliecoonan
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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? Answer
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elliecoonan
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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.
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HS_1
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(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.
can u post your working?
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