1.

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 aspeed of 4 m s' relative to the trolley in a direction opposite to the its motion, andJumps out of the trolley. What is the final speed of the trolley? How much has thetrolley moved from the time the child begins to run?

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