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A robot is programmed to move at a constant speed of 1 5 m / s westwards for 4 0 seconds. the robot then turns

A robot is programmed to move at a constant speed of 15m/s westwards for 40 seconds. the robot then turns and travels north at 40m/s for an additional 20 seconds. what was the robot's avergae speed for the entire trip? what is the robots' displacement(magnitude and direction) after segments.  

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