- #1

- 177

- 0

I dont know what to use. Conservation of momentum doesnt work because I need at least one of the velocities.

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- Thread starter formulajoe
- Start date

- #1

- 177

- 0

I dont know what to use. Conservation of momentum doesnt work because I need at least one of the velocities.

- #2

- 508

- 0

I think conservation of momentum is the right idea. I think you got to use it.

You got to find the final momentum. The idea is that the cars stick together after collision. So the final momentum is [itex](m_1 + m_2)v_{final}[/itex]. You got to find [itex]v_{final}[/itex].

You can do that. The cars are decelerated by a constant force of friction. This force is [itex]F = .92(m_1 + m_2)g[/itex]. From [itex]F[/itex] and [itex]d = .76m[/itex] you can calculate [itex]v_{final}[/itex].

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