Physics question? (suvat) UKCAT

Announcements Posted on
How helpful is our apprenticeship zone? Have your say with our short survey 02-12-2016
    • Thread Starter
    Offline

    2
    ReputationRep:
    Explain to me how is accelerating from rest to 60mph in 6s is equivalent to moving at 30mph for 6s????

    The QR on the UKCAT mock 1 is unbelievably hard!!
    • Thread Starter
    Offline

    2
    ReputationRep:
    IMG
    Attached Images
     
    Online

    3
    ReputationRep:
    (Original post by bobwibbles)
    Explain to me how is accelerating from rest to 60mph in 6s is equivalent to moving at 30mph for 6s????

    The QR on the UKCAT mock 1 is unbelievably hard!!
    If you draw a graph of speed versus time for accelerating from rest to 60mph in 6s, you would get a straight line pass through the origin to 60 mph. The area under this graph is the distance travelled by the object in 6 s.

    It is found by calculating the area of a triangle:

     \frac{1}{2} \times 60 \text{ mph} \times 6 \text{ s}

    Before computing the whole thing do a bit of simplification,

     \frac{1}{2} \times 60 \text{ mph} \times 6 \text{ s} = 30 \text{ mph} \times 6 \text{ s}

    Actually, 30 mph is the average speed for the journey of accelerating from rest to 60mph in 6s.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Eimmanuel)
    If you draw a graph of speed versus time for accelerating from rest to 60mph in 6s, you would get a straight line pass through the origin to 60 mph. The area under this graph is the distance travelled by the object in 6 s.

    It is found by calculating the area of a triangle:

     \frac{1}{2} \times 60 \text{ mph} \times 6 \text{ s}

    Before computing the whole thing do a bit of simplification,

     \frac{1}{2} \times 60 \text{ mph} \times 6 \text{ s} = 30 \text{ mph} \times 6 \text{ s}

    Actually, 30 mph is the average speed for the journey of accelerating from rest to 60mph in 6s.
    Ah makes sense. Thank you!
 
 
 
Write a reply… Reply
Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: September 18, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Today on TSR
Poll
Would you rather have...?
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.