A body moves with respect to a stationary reference point. At time 1.0 s, position of the body is given by vector R1 bar that points to the east of the reference point and has magnitudeee 5.0m. At time 2.0 s, the body's position is given by vector R2 bar that points to west and has magnitude 10.0 m. Find the displacement vector Delta R bar of the body. What is the magnitude of the displacement? Find the average velocity of the body. What is its speed?