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Roller Coaster

  • Thread starter Jtappan
  • Start date
  • #1
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Homework Statement


A cart starts from position 4 in the figure below with a velocity of 13 m/s to the left. Find the speed with which the cart reaches positions 1, 2, and 3. Neglect friction.
fig-030.gif


speed at position 1 ___ m/s
speed at position 2 ___ m/s
speed at position 3 ___ m/s

Homework Equations



E_tot1 = E_tot2 = E_tot3 = E_tot4

The total energy is kinetic energy plus potential energy
E_tot = E_kin + E_pot

E_pot = m * g * h
with m the mass of the cart, g the gravitational constant of Earth (g=9.81m/s^2) and h the height.

E_kin = 1/2 * m * v^2


The Attempt at a Solution



I attempted to do this problem and I cannot figure out how to solve for any of them if I am not given the mass of the cart.
 

Answers and Replies

  • #2
hage567
Homework Helper
1,509
2
You shouldn't need the mass, since it will be common to each term and you will be able to cancel it out.
 

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