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September 19, 2014

Homework Help: physics

Posted by Linn on Thursday, March 12, 2009 at 11:55pm.

I have a diagram of a roller coaster. It starts at a height of 100m where the v=0, it then drops completely to the ground and then goes into a loop that is 75m high; the point where the loop starts is point A. From the loop, the track raises to e height of 50m (this is point B) and then the track goes up to 80m, there, another loop forms (this is point C) and then the track goes up again to now a height of 90m at point D.
Find the velocity of the roller coaster at each point.
I'm not sure how to do this because I don't have the mass to do GPE=mgh. Please help.

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