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Colorado State University Speed and Mass Physics Question

 

I’m working on a physics question and need a sample draft to help me study.

A box with a mass of m, =2.7 kg is sliding along a frictionless horizontal table with a speed of 1 m/s and impacts a stationary box m2 = 1.1 kg. stick together and then fall off the table. What is the speed of the boxes as they hit the ground 0.8 m below where they fell off the table?