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Cars pass a point travelling at 45.0(5),...

Cars pass a point travelling at `45.0(5), 47.0(7) 50.0(9), 53.0(4) and 57.0(1)km h^(-1)`. The numbers in brackets give the number of cars with respective velocities. Calculate the RMS velocity and average velocity. 

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RMS velocities 49.06km`h^(-1)` ,average velocities 48.96km`h^(-1)`
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