Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    2
    ReputationRep:
    Name:  image.png
Views: 45
Size:  75.9 KB Could somebody please explain why using v-1 rather than v+1 is incorrect? Using v+1 I get the correct answer but v-1 makes both v's off by 1/5.
    Offline

    8
    Can I see the kind of diagram you've drawn? It's mostly because of poor diagrams why people get these questions wrong frequently especially in M2, so post
    a picture of a diagram as it'd be easy to see where you've gone wrong.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Marxist)
    Can I see the kind of diagram you've drawn? It's mostly because of poor diagrams why people get these questions wrong frequently especially in M2, so post
    a picture of a diagram as it'd be easy to see where you've gone wrong.
    Name:  image.jpg
Views: 56
Size:  500.4 KB
    Offline

    8
    (Original post by Middriver)
    Name:  image.jpg
Views: 56
Size:  500.4 KB
    This is not a good diagram. I think this is where your problem lies imho. You've over complicated very simple equations too. Try to do it differently this time. I'll give you a hint - make sure you've got a diagram of 'before' and 'after' collision. The whole question takes very little effort with a good diagram - in fact most mechanics questions do.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Marxist)
    This is not a good diagram. I think this is where your problem lies imho. You've over complicated very simple equations too. Try to do it differently this time. I'll give you a hint - make sure you've got a diagram of 'before' and 'after' collision. The whole question takes very little effort with a good diagram - in fact most mechanics questions do.
    Could you draw diagrams for both v+1 and v-1 if you wouldn't mind.
    Offline

    8
    (Original post by Middriver)
    Could you draw diagrams for both v+1 and v-1 if you wouldn't mind.
    Yes, although I am currently doing some stuff. I'll try and help you out so please remind me if I've forgotten. Thanks.
    Offline

    7
    ReputationRep:
    (Original post by xyz9856)
    using v-1 is incorrect for the right side. How could it be going slower than the first particle after the collision when in the question it states they haven't become 1 particle
    (Original post by Middriver)
    x
    123
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

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.