- #1
Jath
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Homework Statement
An auto travels at the rate of 25 km/hr North for 4 hours, then at 50 km/hr North for 8 hours, and finally 20 km/hr North for 2 hours. Find (a) the total distance covered in km and (b) the average velocity for the complete trip in m/s.
Homework Equations
d=vt
The Attempt at a Solution
>
v1= 25 km/hr N
t = 4 hrs
>
d=vt
d1=(25km/hrN)(...)
If someone can just work through this and tell me what things mean and why that would be great.
4. Answer from Teacher
540 km; 107(or 10.7) m/s N
Homework Statement
A train travels at an average velocity of 120 km/h for 3 hours, then at 80 km/h for 210 km. The train stop for 1 hour. Finally, the train covers 300 km in 2.9 hours. All motion is to the NORTH. (a) What is the train's displacement at the end of the first 3 hours? (b) How much time was spent going 80 km/h in the second leg of the trip? (c) What was the average velocity for the final 3.9 hours of the trip? (d) Calculate the average velocity for the whole trip. (e) Calculate the average velocity if the second part of the trip (80 km/h for 210 km) were to the SOUTH.
Homework Equations
d=vt
The Attempt at a Solution
Honestly, with this question I have no clue what to do. Same as above, if someone can help me go through this that would be great.
4. Answer from Teacher
360 km N; 2.6 hr; 103.4 km/hr N; 91.6 km/hr W; 47.4 km/hr N
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