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A 10kg box and a 30kg box are placed side by side on a frictionless horizontal...

A 10kg box and a 30kg box are placed side by side on a frictionless horizontal surface. An ideal massless spring with a spring constant of 1920N/m is compressed by a distance of 50cm and placed tightly between the two boxes as shown in the figure. The spring and boxes are then released. Find the speeds of the two boxes after the spring has been released.

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