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: Two cars are traveling on a desert road, as shown below. After 5.0 s, they are side by side at the next telephone pole. The distance between the poles is 70.0 m. Identify the following quantities:
a. the displacement of car A after 5.0 s
b. the displacement of car B after 5.0 s
c. the average velocity of car A during 5.0 s
d. the average velocity of car B during 5.0 s

Respuesta :

AL2006

"Displacement" = (straight-line distance and direction from start-point to end-point)

a). From the first picture to the the second picture, Car-A has moved forward by one telephone pole.  That's 70 m.  His displacement during that five seconds is 70-m in the direction of whatever direction the road is heading.

b). From the first picture to the the second picture, Car-B has moved forward by TWO telephone poles.  That's 140 m.  His displacement during that five seconds is 140-m in the direction of whatever direction the road is heading.

Average velocity = (displacement) / (time for the displacement)

c). Car-A average velocity = (70 m)/(5 sec) = 14 m/s in the direction of the road.

d). Car-B average velocity = (140m)/(5sec) = 28 m/s in the direction of the road.

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