On a straight road with the +x axis chosen to point in the direction of motion, you drive for 3 hours at a constant 20 miles per hour, then in a few seconds you speed up to 70 miles per hour and drive at this speed for 1 hour. What was the x component of average velocity for the 4-hour period, using the fundamental definition of average velocity, which is the displacement divided by the time interval? vavg, x = miles per hour Suppose instead you use the formula vavg, x = vix + vfx / 2. What do you calculate for the x component of average velocity? vavg. x = vux + vfx/2 = miles per hour Why does the formula used in part (b) give the wrong answer? That formula can only be used for projectile motion, such as a baseball that has been hit. That formula isn't valid unless vx changes at a constant rate (constant force). That formula only applies at high speeds.
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On a straight road with the +x axis chosen to point in the direction of motion, you drive for 3 hour...
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