A train at 90 km/h brakes steadily and comes to rest in 40 s.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A train at brakes steadily and comes to rest in . (a) Find its retardation. (b) How far does it go while stopping?
Need a reminder? The key ideaShow
Acceleration , in . It is positive when the velocity grows and negative when it falls in the positive direction.
On a distance-time (or position-time) graph the slope is the velocity. On a velocity-time graph the slope is the acceleration and the area under the line is the distance.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Units. .
Step 2. (a) : a retardation of .
Step 3. (b) .
Answer: ; .
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