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a particle is constrained to move along a straight line through O.

it starts initially at D, which is a fixed distance from O in the positive direction&moves at a constant velocity of 4ms^-1 for 15 sec. until; it is 100m from O for a furhter 25 sec, after which it travels in the opposite direction for 20 sec.

the total distance is 180m.


How far from O does the particle stop?

how do i draw a velocity–time graph?

and what is the final displacement of the particle from its initial position? ...?