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[" A particle travels along a "],[" stra...

[" A particle travels along a "],[" straight line.It travels at a "],[" constant speed of "5m/s" for "10],[" seconds and then at a different "],[" constant speed of "10m/s" along "],[" the same direction for the next "],[20" seconds.The average speed "],[" during the entire "30" seconds of "],[" travel is "]

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[" A particle starts with an "],[" initial velocity of "10m/s" and "],[" moves with uniform "],[" acceleration of "2m/s^(2)" along "],[" straight line for "5" seconds,"],[" then it retards at "5m/s^(2)" and "],[" comes to rest.The total "],[" distance travelled is "]