I just updated my Macbook pro's OS from Maverick to Yosemite...now my safari doesnt open and always quits

Macbook Pro (13inch , Mid 2012 )
processor 2.5Ghz Intel core i5
memory 4Gb 1600Mhz DDR3
OS X Yosemite version 10.10.1

See if Safari starts if you launch it while holding down the SHIFT key. If it does, it means you have some incompatible Safari extensions. While still launch via the SHIFT key method, go to Safari Preferences > Extensions tab and turn off all extensions.  Then see if Safari opens normally and report what you found.
I have the same MBP as you. I upgraded to Yosemite last week and Safari works perfectly. I run no virus software or "cleaning/tuneup" utilities and have only one extension from a trusted source that keeps it updated.
You may have acquired a piece of malware from an unscrupulous download hosting site. If disabling extensions does not help, please use the instructions in this Apple article:
Remove unwanted adware that displays pop-up ads and graphics on your Mac - Apple Support

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