Answers

2014-05-13T19:48:16+05:30
Any motion is a relative motion because you are either in a reference frame or a non reference frame
a motion which we observe without being in motion is the motion with respect to the earth since the earth is not stationary

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2014-05-13T20:36:21+05:30
 when you are in any reference frame which is moving at a constant velocity with respect to the the moving direction . For example, you can toss and catch a ball in a moving train if the motion is in a "straight line" at constant speed(when some 1 pulls the chain then train will stop suddenly so u feel the motion (respective to the direction of motion )
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