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What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

What object a collides with object b and bounces back its final momentum is?

3. a lunar exploration vehicle was created by a research team. it weighs 3,000 kg on the earth. it needs an acceleration of 10 m/s2 on the moon. in order to have the same acceleration, what will be the net force acting on the vehicle on the earth?