Hi I was wondering if anyone could help me with a mechanics question:
Two cars are travelling at constant speed v, with one car a distance d ahead f the other. As each car passes a marker post it accelerates with acceleration a to a new constant speed V. Show that the new distance D between the cars D = Vd/v
I drew a speed/time graph and obtained:
d = v(time to the marker for the car behind - time to the marker for the first car)
D = (V - v)(time to the marker for the car behind - time to the marker for the first car)
Then doing some algebra I obtain:
D = dV/v - d
Thanks for any help.
M1 Edexcel question Watch
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Last edited by tommy_lees; 04-09-2016 at 11:09.
- 04-09-2016 11:08
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- 06-09-2016 12:20
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Just quoting in Fox Corner so she can move the thread if needed
Spoiler:Show(Original post by Fox Corner)
- 06-09-2016 12:36
In M1, the only formulas that you need to know are the suvat equations and impulse (I think, I don't remember as I did it 2 years ago), as they have not stated anything about time, the only formula that you can use is v2=u2+2as
Have they given any other information? Could I see the graph please?