A pickup truck is traveling along a straight flat highway at aconstant speed of 10 m/s measured relative to the ground.A person standing in the flatbed of the pickup truck throwsa ball into the air at an angle of 60° above the horizontal asmeasured relative to the truck and in line with thehighway. A second person who is standing on the groundnearby observes the ball to rise vertically. Take thepositive direction of the x -axis to point horizontally in thedirection of motion of the truck and the positive directionof the y -axis to point straight up from the ground. Findthe velocity of the ball relative to the truck in unit vectornotation.

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