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M1-kinematic graphs

Could someone go through this question with me please I'm a little confused, I think I've done a and b but not correctly and I don't know how to do c! ImageUploadedByStudent Room1383132225.820873.jpg


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Original post by Mathsphysicspe
Could someone go through this question with me please I'm a little confused, I think I've done a and b but not correctly and I don't know how to do c! ImageUploadedByStudent Room1383132225.820873.jpg


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Your speed-time graph should consist of three straight lines.
Using time axis horizontal and speed vertical.
First line is from (0,10) 20 (t1,3) where t1 is the time decelerating.
Second line is horizontal from (t1,3) to (t2,3)
Third line is from (t2,3) to (T,0) where T is the total time to reach the barrier.
Use fact that area under the velocity-time graph measures distance traveled to set upo suitable equations.
If you get stuck again, post your solution as far as you can get.

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