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85. A motor car travelled the first third of the distance s at a speed of v1=10kmph,the second third at a speed of v2=20kmph and the last third at a speed of v3=60kmph.Determine the mean speed of the vehicle over the entire distance s

Answer» 85. A motor car travelled the first third of the distance s at a speed of v1=10kmph,the second third at a speed of v2=20kmph and the last third at a speed of v3=60kmph.Determine the mean speed of the vehicle over the entire distance s


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