When i rotate an object by 360 degrees in 100 frames and playback the animation, the object rotates fast in the first 10-20 frames,then slowly,then again fast in the last 10-20 frames.
(In doing this i made a key on frame 1 at 0 degrees and on frame 100 at 360 degrees)I also playblasted it,but same thing happened.

How can i get uniform rotation speed throughout the animation(100 frames)?

I did that but still the same thing is happening.
I have attatched my file (500 frames) ; with this message.
In this file i have breaked the tangents as you said but still their is no uniform speed.
Please see it and tell me what is wrong.
Thanks in advance…

Your file did not attach…
Can you post a screenshot of your graph editor with the object selected?

n8skow [FA]

how can i attatch a file in my post?
(i click on browse, give the path of my file and post the message, but file is not attatched.)