IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: ayoubi on June 11, 2009, 09:52:23 am

Title: First question in physics last night in paper one
Post by: ayoubi on June 11, 2009, 09:52:23 am
it was very very tricky...
i chosed C as the answer of 60km/h by adding 90+30/2
what about you guyz?
Title: Re: First question in physics last night in paper one
Post by: bball92 on June 11, 2009, 09:54:47 am
i chose 50, because even though the top speed of the car was never more than 90 and lowest speed was 30, the total distance travelled was 100KM, if you took 60 as ur average speed per hour for your journey, that would mean u end up travelling 120km overall which is incorrect :S.

Thats the way i looked at it :P
Title: Re: First question in physics last night in paper one
Post by: IGis2easy on June 11, 2009, 12:40:40 pm
no man ure rite its 90 + 30 /2 giving 60 ;D
i am pretty sure cuz i checked the answer with ma teacher  ;) :D
Title: Re: First question in physics last night in paper one
Post by: susman on June 11, 2009, 01:40:25 pm
well i thought the max and min speed was given to confuse you...
avg speed is total distance / total time taken..
it comes out to be 50 km/hr
the 60 km/hr is wrong
Title: Re: First question in physics last night in paper one
Post by: thukon on June 11, 2009, 01:51:13 pm
60km/h is WRONG. 50 is correct. They gave you the max and min values to confuse you. Your physics teacher must be like my physics teacher/
Title: Re: First question in physics last night in paper one
Post by: sundars on June 11, 2009, 01:55:27 pm
It's 50km/h since 100/2=50, not 60.
What was the last answer was it 16 nucleons.
Title: Re: First question in physics last night in paper one
Post by: panther on June 11, 2009, 02:36:23 pm
The maximum and minimum speed has nothing to do with the average.

Average speed = Total distance/Total time
Title: Re: First question in physics last night in paper one
Post by: shagurl on June 12, 2009, 04:12:29 am
Quote from: Panther on June 11, 2009, 02:36:23 pm
The maximum and minimum speed has nothing to do with the average.

Average speed = Total distance/Total time

AGREDD ;D ;D ;D ;D
Title: Re: First question in physics last night in paper one
Post by: IG4ever on June 12, 2009, 05:23:16 am
yup AVERAGE speed = Total distance traveled / Total time taken... 100/2= 5o km/hr.
no use of the max.and min. speed. CIE wanted to confuse us  :o
Title: Re: First question in physics last night in paper one
Post by: godfather93 on June 12, 2009, 06:25:55 am
60+30/2 is the average of the speeds whereas 100/2 is the average speed.