Projectile motion question!!!! PLEASE HELP!!!?

How do I measure the initial velocity of an object when it is launched and air resistance is taken into account???
Update: sorry, please IGNORE the first question... I'm doing a practical involving projectile motion: "Do shapes, weight and density affect the range of the projectiled objects?" I've been doing research for weeks trying to figure out how and what to use to launch these objects (all objects being... show more sorry, please IGNORE the first question...


I'm doing a practical involving projectile motion:
"Do shapes, weight and density affect the range of the projectiled objects?"

I've been doing research for weeks trying to figure out how and what to use to launch these objects (all objects being launched with the same velocity). Plus, with the presence of air resistance finding the final velocity, i think, is hard...
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