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# What speed would it have at the bottom of the hill? If the signal operators were able to switch the points so that the run-away carriage crashed into two other carriages at the bottom of the hill in an attempt to stop it, what speed would the entanglement

According to the Code of
Practice for the Victorian Main Line Network (2011) “Trains when shunting must
not exceed 15km/h” (http://www.artc.com.au/library/TA20_Section_12 .pdf section 10.(c)) and when shunting on an incline
“sufficient number of handbrakes must be applied to prevent the train or
vehicles running down the incline (Section 14(a)). There used to be a train
that ran from Midland up through Mundaring and on into the hills. The part of
the track between Mahogany Creek and Bellevue drops 280 m in 12 km if the
breaks were not applied and a carriage started rolling from Mahogany Creek down
to the bottom of the hill what acceleration would it have if you could ignore
air resistance? What speed would it have at the bottom of the hill? If the
signal operators were able to switch the points so that the run-away carriage
crashed into two other carriages at the bottom of the hill in an attempt to
stop it, what speed would the entanglement of carriages have in km/h?