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Just got a homework about graphs of motion. I have solved all the problems but got stuck in one of them. Here's the problem:-

I solved it like this:-

0 to t1 - Uniform Motion with negative velocity

t1 to t2 - Rest

t2 to t3 - Uniformly retarded

I asked my teacher and he told me that the last step is wrong i.e. t2 to t3 is wrong.

Would someone please tell me where i am wrong?

Thanks....