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A particle moves in a straight line. Its...

A particle moves in a straight line. Its position ( in m) as function of time is given by
`x = (at^2 + b)`
What is the average velocity in time interval ` t = 3s to t = 5s in ms^(-1)`. (where a and b are constants and a `= 1ms^(-2), b = 1m`).

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