A truck equipped with a massless spring in front crashes with a stationary truck. The mass of the incoming truck is six times the mass of the normal truck. While the spring is being compressed, the trucks are moving closer together, and while it is expanding they are moving farther apart, but at the instant that the spring is fully compressed, they have no relative motion, which means they are moving at the same speed. At this instant, the cars are moving with a speed of 4.2 m/s.- Find the speed of the incoming car before the collision.

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