(Solved): A single red train car moving at \( 45 \mathrm{~m} / \mathrm{s} \) collides with three stationary ...

A single red train car moving at \( 45 \mathrm{~m} / \mathrm{s} \) collides with three stationary blue train cars connected to each other. After the collision, the red train car bounces back at a speed of \( 20 \mathrm{~m} / \mathrm{s} \), and the blue train cars move forward. If the mass of a single blue train car is twice the mass of a red train car, what is the speed of the blue train cars (in \( \mathrm{m} / \mathrm{s} \) ) after the collision? Round to the nearest hundredth (0.01).