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A particle moves in a straight line with a
constant velocity of 20 m/s for 10 seconds.
It is then subjected to a constant
acceleration of 5 m/s2 in the opposite
direction for T seconds, at which time the
particle is back to its original position.
a) Sketch the velocity-time graph
representing the motion.
b) Find how long it takes the particle to
return to its original position.

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