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Thats exactly where the whole problem lies...we can't have all the information available to us (the uncertainty principal)..No one view is privilaged..The guy on the train has no reason to believe the train is moving..the ball still obeys all the laws of motion as if the train were not moving...ya see??the guy may know the train is going 100, but the ball doesn't..it just follows the laws of motion...so which laws are actually effecting the ball...it can't be the forward speed of the train or else it would hit the wall and bounce around like a crazzy flubba ball...as long as the train doesn't change acceleration, there is no change in its LOCAL experiance...but the guy watching from the ground can't say the same thinmg can he...if he were to try and make a physical calculation he would have to factor in its forward movement...so the equation he would observ would be a different one to the guy on the train...bbut NEITHER are privillaged..its all relative to the speed of the observer...RELATIVITY
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