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A car weighing 2xx10^(3)kg and moving a...

A car weighing `2xx10^(3)kg` and moving at `20 m//s` along a main road collides with a lorry of mass `8xx10^(3)kg ` which emerges at `5 m//s` from a cross road at right angles to the main road. If the two vehicles lock, what will be their velocity after the collision ?

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