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# M1 Edexcel question

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1. 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

So far:

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.
2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

You can also find the Exam Thread list for A-levels here and GCSE here.

Just quoting in Fox Corner so she can move the thread if needed
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(Original post by Fox Corner)
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3. 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?

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