A physics instructor drives down to St. Louis to visit his mom. On the way there, he travels the first half of the time at 70 km/hr and the second half the time at 100 km/hr. Coming back, he drives the first half the distance at 70 km/hr and the second half of the distance at 100 km/hr.
a)What is his average speed going down to St. Louis?
b)What is his average speed coming back from St. Louis?
c)What is his average speed during the entire trip?
d)What is his total displacment during the entire trip?
2006-08-30 07:25:20 · 6 answers · asked by dhruv 1 in Science & Mathematics ➔ Physics
This is easiest to deal with if we assume a particular distance driven. Suppose that the distance is 170 km. Then the trip home obviously takes a bit over two hours: he drives 85 km at 70 km/hr, which takes 1.214 hour, and 85 km at 100 km/hr, which takes 0.850 hour; total 2.064 hr...
Now suppose that on the trip down, each leg took one hour to drive. The distance traveled would be 70 + 100 km, or 170 km. This matches the distance home, so we're done with the basics. The rest of the problem is trivial.
2006-08-30 07:56:09 · answer #1 · answered by Anonymous · 0⤊ 0⤋
you will possibly desire to bypass to woodland Park and bypass to the St. Louis Zoo. that's between the very ultimate interior the country and it is likewise loose. additionally, Six Flags is unquestionably approximately 30 - 40 5 minutes from St. Louis in Eureka. The technological awareness middle in woodland Park is yet another super place to bypass to. there is likewise delivers Farm that's placed purely some miles from St. Louis. they have an wonderful petting zoo for the kiddies and pa gets to pattern countless the Anhueser Busch products (cut back 2). i in my opinion propose the zoo in case you could no longer get everywhere else.
2016-11-06 02:10:54 · answer #2 · answered by saturnio 4 · 0⤊ 0⤋
The null set. We don't drive in kilometers/hr in the U.S.
2006-08-30 07:32:29 · answer #3 · answered by Spud55 5 · 1⤊ 0⤋
a. 85km/h
b. cannot be calculated because you are missing any one of the following parameters: total travel time, starting location, or distance traveled.
c. cannot be calculated because you are missing any one of the following parameters: total travel time, starting location, or distance traveled.
d. cannot be calculated because you are missing any one of the following parameters: total travel time, starting location, or distance traveled.
2006-08-30 08:26:57 · answer #4 · answered by sprcpt 6 · 0⤊ 0⤋
I choose a....hehe
2006-08-30 07:34:16 · answer #5 · answered by A 4 · 0⤊ 1⤋
I HATE PHYSICS!!!!
2006-08-30 07:31:23 · answer #6 · answered by funmzire 5 · 0⤊ 1⤋
B
2006-08-30 07:30:24 · answer #7 · answered by hollisterco22 1 · 0⤊ 1⤋