Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta
    • Thread Starter
    Offline

    13
    ReputationRep:
    Attached is a graph of velocity against time.
    My question is to prove that

    s = ut + 1/2at^2

    I start by finding the area of the rectangle, knowing that the area under the line gives displacement.

    s = ut

    I then find the area of the triangle

    1/2 (v-u) * t

    = 1/2 * at * t
    = 1/2at^2

    So I thought that the rectangle - area gives the area
    being s = ut - 1/2 at^2

    but why is this not the case?
    Attached Images
     
    • Thread Starter
    Offline

    13
    ReputationRep:
    Update - i am so silly sorry i noticed the mistake.
    Offline

    20
    ReputationRep:
    (Original post by nwmyname)
    Attached is a graph of velocity against time.
    My question is to prove that

    s = ut + 1/2at^2

    I start by finding the area of the rectangle, knowing that the area under the line gives displacement.

    s = ut

    I then find the area of the triangle

    1/2 (v-u) * t

    = 1/2 * at * t
    = 1/2at^2

    So I thought that the rectangle - area gives the area
    being s = ut - 1/2 at^2

    but why is this not the case?
    you're trying to do this...

    Name:  sequalsutplushalfatsquared.png
Views: 54
Size:  9.5 KB
    • Thread Starter
    Offline

    13
    ReputationRep:
    (Original post by Joinedup)
    you're trying to do this...

    Name:  sequalsutplushalfatsquared.png
Views: 54
Size:  9.5 KB
    I know haha I looked at it from completely the wrong way!
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: April 20, 2016
Poll
Do you agree with the proposed ban on plastic straws and cotton buds?

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

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