IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: helllife on November 10, 2009, 04:56:27 pm
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the question is....
A motor cycle goes from station A to B at 40km/h and then return from B to A at 120 km/h. Calculate average speed and average velocity during the round trip.
for average velocity it would zero, as the displacement is zero.....
but how the average speed is 60km/h??
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the question is....
A motor cycle goes from station A to B at 40km/h and then return from B to A at 120 km/h. Calculate average speed and average velocity during the round trip.
for average velocity it would zero, as the displacement is zero.....
but how the average speed is 60km/h??
don't you have to know the total distance and time taken to find the average speed? :-\
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well there is no other data given except the speeds mentioned above........do u how to do then?
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I think you're missing something there.. You either need the distance from A to B or you just need the time he took to travel =/
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isnt there any other way? if anyone knows.......pls answer...
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Average speed = Total distance travelled / Total time taken
So without the time / distance, you can't solve it =/
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ohhh, okay. i get it.
let's assume the distance from A to B is d, so the total distance is 2d.
then, using d=st, you find that the time from A to B is d/40 and from B to A is d/120
so the total time = d/40 + d/120
and the average speed = 2d / (d/40 + d/120)
= 2d / (3d/120 + d/120)
= (2d x 120) / 4d
= 240d / 4d
= 60
;D
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ohhh, okay. i get it.
let's assume the distance from A to B is d, so the total distance is 2d.
then, using d=st, you find that the time from A to B is d/40 and from B to A is d/120
so the total time = d/40 + d/120
and the average speed = 2d / (d/40 + d/120)
= 2d / (3d/120 + d/120)
= (2d x 120) / 4d
= 240d / 4d
= 60
;D
Oh hahahaha! I forgot about the unknowns. Crap, Econs is lagging me behind for Physics T_T
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oh....i got it!!! genius!!!! ;) ;)
Thanx ...will post question more later!! ;D
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oh....i got it!!! genius!!!! ;) ;)
Thanx anyways...will post question more later!! ;D
hah, well i'll try my best to help :)
Oh hahahaha! I forgot about the unknowns. Crap, Econs is lagging me behind for Physics T_T
oh noes D:
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oh....i got it!!! genius!!!! ;) ;)
Thanx ...will post question more later!! ;D
Yes yes, post more as some kind of training for us for A Level xD
And @falafail : Well, I'm finally done with econs!
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Yes yes, post more as some kind of training for us for A Level xD
And @falafail : Well, I'm finally done with econs!
is this A level?! i thought it was IGCSE! D:
we don't get questions like this.. :-\
done studying or done with the exam, you mean?
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is this A level?! i thought it was IGCSE! D:
we don't get questions like this.. :-\
done studying or done with the exam, you mean?
Done studying xD And well, it does help us for A level in a way, I guess... If we're lucky we may get questions like this xD
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Done studying xD And well, it does help us for A level in a way, I guess... If we're lucky we may get questions like this xD
HA, you wish :P
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HA, you wish :P
Hahaha! Okay, I'm gonna try my best to get 30/30 for tomorrow! :D Go me!
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Hahaha! Okay, I'm gonna try my best to get 30/30 for tomorrow! :D Go me!
good luck! ^_^
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good luck! ^_^
Lawl, it wasn't as easy as I thought but should be fine :P
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u done wit paper 1 physics?/
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u done wit paper 1 physics?/
Nah, it was Economics Paper 1. :)
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Oh lol
yea eco was ez
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Lawl, it wasn't as easy as I thought but should be fine :P
Yay :D
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Oh lol
yea eco was ez
Lol, mine was A Level :) Yours was IGCSE right?
@falafail : Yeah! YAY! :D
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oh ya
lol