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# simple m1 question (short) Watch

1. when using deceleration in a Suvat formula do we automatically use a minus sign in it when plugging it into a formula?

eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)

cheers
2. (Original post by upthegunners)
when using deceleration in a Suvat formula do we automatically use a minus sign in it when plugging it into a formula?

eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)

cheers
depends on the +ve direction chosen
3. (Original post by upthegunners)
when using deceleration in a Suvat formula do we automatically use a minus sign in it when plugging it into a formula?

eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)

cheers

4. (Original post by TenOfThem)
depends on the +ve direction chosen

its that question, it's only 2 marks but using the values I have stated (without taking the minus of the acceleration) I got 30.1m/s which is impossible as he is decelerating from 20m/s..
5. (Original post by upthegunners)
when using deceleration in a Suvat formula do we automatically use a minus sign in it when plugging it into a formula?

eg: s: 200 u:20 v:? a: 1.5m/s ( decelerating, do I put minus infront before using formula?)

cheers
when choosing right as the positive direction, I would use the formula normally, and yeah you would use -1.5 for a
6. (Original post by upthegunners)

its that question, it's only 2 marks but using the values I have stated (without taking the minus of the acceleration) I got 30.1m/s which is impossible as he is decelerating from 20m/s..
In that case -ve as you will be looking at +ve t
7. (Original post by TenOfThem)
In that case -ve as you will be looking at +ve t
what do you mean?
8. (Original post by upthegunners)
what do you mean?
Sorry, complete lack of clarity in my previous response

Graph questions (and horizontal motion generally) just has +ve "to the right" or in the direction of +ve time

When I mentioned +ve direction I was really referring to vertical questions

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