Consider a wind velocity of 50 mi/h at an angle of 30° north of east. North 30° The magnitude of the vector is given: 50 mi/h Pre-Lab Question #1: Find x and y components of this example using trigonometry 1-D velocity example. Bob is truck surfing. The truck is traveling at +20 m/s. Bob can throw a ball a 10m/s. If he throws it in the + direction, what is the speed of the ball as observed by a roadsid observer? This is a vector addition problem. Starting with BallRelative ToEarthBallRelativeTo Truck T TruckRelaive ToEarth -+10m/s +20m/s =+30 m/s Pre-Lab Question #2: What if he throws it in the'-'direction? Solve: Three friends pull on a box in the directions shown below. What is the net force? Express magnitude and angle direction relative to the x axis. Solution: Again, first choose a suitable coordinate system. 120N the xy system shown. Then write each force using x and y components 100N 60° F3 20 F2

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