Question

Find the displacement, average velocity, and average speed of the car in the figure below between positions A and F. (Enter all distances in m, all velocities in m/s, and all times in s.) Acar moves back and forth wong ahe The care the right between positio Aan information about the moon of the bed w) 40 С -60-50-10-30 -20 -100 100 40 wo C -60-50-10-30 -20 -10 10 20 w 40 The war the left been -10 0 10 50 SOLUTION Consult the figure to form a mental image of the car and its motion. We model the car as a particle. From the position time graph given in figure (b), notice that mat - Os and that Use the following equation to find the displacement of the car In this case) from where it started. This number has the correct units and is of the same order of magnitude as the This result means that the car ends up 83 m in the negative direction to the supplied data. A quick look at figure a indicates that it is the correct answer Use the following equation to find the average velocity

Answer 1

Sol. XA= 30m at ta=os xf = - 53 m at tf = 505 => AX= xf - NA -53 - 30 = -83 m => to the left =) Va, aug -83 50 = ER-XH -53 - 30 te - BA 50-0 = -1.7 mls Nx,arg -> from A to B 22 m => from B to F = 105m = 105m => Varg. d 127 50 - 2.5 m/s The average speed of car would change because the distance is different, but the average velocity would not change.