You are Here: Home >< Maths

# M1 Impulse question

Announcements Posted on
Last day to win £100 of Amazon vouchers - don't miss out! Take our quick survey to enter 24-10-2016
1. A ball of mass 0.2kg falls vertically and strikes horizontal ground with a speed of 8m/s. The ball rebounds vertically with a speed of 6m/s.
Find the impulse exerted on the ball by the ground during the impact.

I got 28Ns but the mark scheme had -28Ns. Why do they take -6 and then positive 8 when working out I instead of -8 and 6?
2. (Original post by ozmo19)
A ball of mass 0.2kg falls vertically and strikes horizontal ground with a speed of 8m/s. The ball rebounds vertically with a speed of 6m/s.
Find the impulse exerted on the ball by the ground during the impact.

I got 28Ns but the mark scheme had -28Ns. Why do they take -6 and then positive 8 when working out I instead of -8 and 6?
Where is this from? Edexcel questions would always ask for the magnitude of the impulse since it is entirely up to you whether you take up or down as positive. If it wants the direction as well, then it would be upwards, rather than a + or - issue.
3. (Original post by tiny hobbit)
Where is this from? Edexcel questions would always ask for the magnitude of the impulse since it is entirely up to you whether you take up or down as positive. If it wants the direction as well, then it would be upwards, rather than a + or - issue.
This is from a CCEA M1 paper.
Ok, thanks

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
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
1. Oops, you need to agree to our Ts&Cs to register

Updated: May 19, 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.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources