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# M1 average velocity vs average speed

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1. Hi

This is question 8d) from the AQA m1B June 13 paper.

Would anybody mind explaining it to me? I put that Av. Velocity would be smaller than average speed since the value of the helicopter's displacement will be smaller than the distance it travels. The mark scheme says otherwise...

Thanks
2. (Original post by Serine)
Hi

This is question 8d) from the AQA m1B June 13 paper.

Would anybody mind explaining it to me? I put that Av. Velocity would be smaller than average speed since the value of the helicopter's displacement will be smaller than the distance it travels. The mark scheme says otherwise...

Thanks
I don't think you'd be able to say whether it was greater or smaller, but simply that the helicopter follows a curved path (since there is a t^2 in the position vector) and hence, since it doesn't move in a straight line, the average velocity will not be equal to the average speed. So (possibly?) the average velocity is then larger.

I'm only answering because nobody else has yet, so forgive the vagueness.
3. Zacken is correct, it will not be the same, the helicopter does not move in a straight line (seen from the quadratic) between the points so the distance will not be equal to displacement!

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