marihelenh
  • marihelenh
A motorist drives 150 km from one city to another in 2.5 h but makes the return trip ikn only 2.0 h. What are the average speeds for (a) each half of the round trip and (b) the total trip.
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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marihelenh
  • marihelenh
@triciaal @amistre64
amistre64
  • amistre64
what is your concept of an average speed?
marihelenh
  • marihelenh
What do you mean? I tried the problem and I got some answers, could you see if I am on the right path with this problem?

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More answers

amistre64
  • amistre64
solutions start with knowing what it is you are looking for ... in this case, it wants an average speed.
triciaal
  • triciaal
distance between the cities stays the same
amistre64
  • amistre64
we need to make sure we have a proper definition of average speed to get started
marihelenh
  • marihelenh
s=d/t
amistre64
  • amistre64
more accurately I would say average speed = (distance covered)/(time it took)
amistre64
  • amistre64
s (or speed) is an instantaneous measurement ...
marihelenh
  • marihelenh
|dw:1440972635400:dw|
amistre64
  • amistre64
those are fine for part a, assuming the mathing is correct, structure is fine
marihelenh
  • marihelenh
For part (b) then, could I do, \[\frac{ 150km +150km }{ 2.5h +2.0h }=\frac{ 300km }{ 4.5h }=66.6km/h=67km/h\]
amistre64
  • amistre64
you did fine
marihelenh
  • marihelenh
That's reassuring. Thank you. Can you see if you can help me with another? I am not quite sure how to do it. I kind of get one part, but don't understand it completely.
amistre64
  • amistre64
i can put an eye to it ... then i might be able to determine how useful i can be
marihelenh
  • marihelenh
Ok, well just give me a minute.
amistre64
  • amistre64
k

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