Roller coaster problem

  • #1
Roller coaster Vel. Initial=10m/s, Height initial=100m, and the mass of the coaster is 1000kg all at the starting point (*).
Have to find the speed of coaster at point A, point A's height is the same as the starting points, b is 1/2 of a's height, c's height is zero.
Coaster kinda looks like: * is starting point

..................................................../
......._*_.........._A_......................../
....../----\......./---\......_B_.........../
...../------\__/-----\__/----\......../
__/-------------------------\_c_/


I found Vf of the starting point with vf^2=vo^2+2 a deltaH
and used that Vel for Vo when i do it again but for point h.
what should I do?, my Vf of the starting point i got was 45.4m/s :yuck:
 

Answers and Replies

  • #2
vf^2 = vo^2+ 2*a*(xi-xf)

Vo = 10 each time
a = 9.81 each time
xi = 100 each time
xf = height above ground

this should work
 
  • #3
kp
53
0
what about conservation of energy?
 
  • #4
lightgrav
Homework Helper
1,248
30
I hope ViewtifulBeau realizes that that equation
comes from (as a special case) Energy conservation.

I DO wish you folks would stop treating "g" as an acceleration!
 

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