## Related questions with answers

Two identical 1350-kg automobiles A and B are at rest with their brakes released when B is struck by a 5400-kg truck C that is moving to the left at 8 km/h. A second collision then occurs when B strikes A. Assuming the first collision is perfectly plastic and the second collision is perfectly elastic, determine the velocities of the three vehicles just after the second collision.

Solution

Verified$\textbf{Givens}$:

Two identical automobiles A and B of mass $\bold{m_A=m_B=1350}$ $\textbf{kg}$.

The two automobiles were initially at rest $\bold{v_0=0}$.

The mass of truck C is $\bold{m_C=5400}$ $\textbf{kg}$.

Truck C was moving with velocity $\bold{v_{C_0}=8}$ $\textbf{km/h}$.

The first collision is perfectly plastic $\textbf{e=0}$.

The second collision is perfectly elastic $\textbf{e=1}$.

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