recall that the average value of f(t) on the interval [a,b] is
∫[a,b] f(t) dt
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b-a
this works here because v is always positive in [0,6]
an object moves along x axis such that its velocity varies with time as v=(50-10t) where t is time in seconds average speed of the particle in the time interval t=0 to t=6s is equal to
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