A trolley of mass 200 kg moves with a un...

A trolley of mass 200 kg moves with a uniform speed of `36 km//h` on a frictionless track. A child of mass 20 kg runs on the trolley from one end to the other (10 m away) with a speed of `4 m s^-1` relative to the trolley in a direction opposite to the its motion, and jumps out of the trolley. What is the final speed of the trolley ? How much has the trolley moved from the time the child begins to run ?

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