Physics, 22.01.2021 21:00 jenesis8

"Big" Al stands on a skateboard at rest and throws a 0.5 kilogram rock at a velocity of 10.0 m/sec. "Big" Al moves back at 0.05 m/sec. What is the combined mass of "Big" Al and the skateboard?

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"Big" Al stands on a skateboard at rest and throws a 0.5 kilogram rock at a velocity of 10.0 m/sec....