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“A body is said to be in motion,if it changes its position with respect to its surroundings.”

Surroundings are the places in its neighborhood where various objects are present.The state of rest or motion of a body is relative.For example,a passenger sitting in a moving bus is at rest because he is not changing his position with respect to other passengers or objects in the bus.But to an observer outside the bus,the passengers and the objects inside the bus are in motion.Therefore we can defined rest as “A body is said to be at rest ,if it does not change its position with respect to its surroundings.”

Answer

The three  types of motion 

                                    (i)  Linear Motion is when all of a body moves in a line 
                                      with all parts moving in the same direction.

                                     (ii) Angular Motion is when a body moves in a circle 
                                          about a point called the axis of rotation.

                                     (iii) General Motion is a combination of linear and angular motion.

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