Physics, 02.11.2019 03:31, dijaflame67

A60-kilogram man holding a 20-kilogram box rides on a skateboard at a speed of positive 7 meters per second. he throws the box behind him, giving it a velocity of negative 5 meters per second, with respect to the ground. what is his velocity, in meters per second, after throwing the object?

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A60-kilogram man holding a 20-kilogram box rides on a skateboard at a speed of positive 7 meters per...