2-1MOTION ALONG ASTRAIGHTLINE2Answers to Multiple-Choice Problems1.C, D2.C3.C, D4.A, B5.D6.C7.A, D8.A9.B10.C11.A12.A, C, D13.B, D14.D15.CSolutions to Problems2.1. Set Up:Let the direction be to the right in the figure.Solve: (a)The lengths of the segments determine the distance of each point from O:and (b)The displacement is the sign of indicates its direction. The distance is always positive.(i) Ato B:Distance is 50 cm.(ii) Bto C:Distance is 30 cm.(iii) Cto D:Distance is 20 cm.(iv) Ato D:Reflect:When the motion is always in the same direction during the interval the magnitude of the displacement andthe distance traveled are the same. In (iv) the ant travels to the right and then to the left and the magnitude of the dis-placement is less than the distance traveled.2.2. Set Up:From the graph the position at each time tis:and Solve: (a)The displacement is (i) (ii) (iii) (iv) (b)(i) (ii) (iii) zero (stays at 2.3. Set Up:Let the direction be to the right. Solve:Average velocity is Reflect:The average speed is greater than the magnitude of the average velocity.
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