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mattmannmf

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b) What is the maximum speed the train can go around a curve of radius 0.9 km if train is not to exceed this acceleration limit?

I don't know what I'm doing wrong for Part B. For part A i did the following:

Vo/ Ac= radius

216/ (.06*g*60)= 6.12 km

now I am trying to find just the speed or Vo which should be like the above but just altered to find the speed:

Vo= Ac*radius

Vo= (.06*g*60)*.9= 31.752 Km/hr...but that's not right.

I then tried to put it into a ratio: 216/6.12= Vo/.9 and solved for Vo which i got as 31.764...very close to my orignal answer.

PLEASE HELP!