What is the average speed of a car traveling at 60 km/h for 2 hours, 70 km/h for 1 hour, and 80 km/h for 3 hours?
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What is the resultant vector when a vector of magnitude 10 units, directed at 30 degrees from the positive x-axis, is added to a vector of magnitude 7 units, directed at 60 degrees from the positive x-axis?
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What's the unit vector in the direction of vector v = ?