- #1
alexandria
- 169
- 2
Homework Statement
Homework Equations
average speed = total distance/total time
average velocity = total displacement/total time
The Attempt at a Solution
please verify if my answers are correct. Thanks :D
im specifically having doubts about a), i don't know how to identify when the truck moves at a quicker or slower pace. I've placed a star * beside phrases that i feel are incorrect. Please check them out.
23. [/B]
a)
The truck *quickly moved 14.0 km (South) in 15 min. The truck continued another 6 km at a *slower pace over 10 min, and then stayed at this location for 5 min. The truck moved at a *slower pace and continued on for another 8 km towards the destination, taking 15 min for this portion of its journey.
b)
This motion represents non-uniform motion. This can easily be seen, since there are changes in the slope of the graph. This indicates that there are changes in the truck’s velocity and direction. As the truck picks up and delivers a cargo of cabbage, it will need to make turns on to other roads, change direction to take different routes, slow down at stop signs and traffic lights, and speed up to pass stop signs and traffic lights. In this case, the truck is not maintaining a constant velocity and is changing directions, so it is an example of non-uniform motion.
c)
total time = 25 min
total displacement: d = 14.0 km + 6.0 km = 20 km
average velocity = total displacement / total time
average velocity = 20 km / 25 min
average velocity = 0.8 km /mind)
Total displacement = 8.0 km (S)
t = 25 min
Average velocity = total displacement / total time
Average velocity = 8.0 km (S) / 25 min
Average velocity = 0.32 km/min (S)