The Student Room Group

Help maths urgent

Help I don’t get why they made the S
Negative 2… I put it as positive and got it wrong :frown:
Part 4.5 b
IMG_2771.jpegIMG_2772.jpeg
(edited 10 months ago)
Reply 1
The diagram / previous thread must make it clear. Its moved downwards 2 m from the initial position so
s = -2
(edited 10 months ago)
Reply 2
We are taking upwards to be positive. When it hits the ground, the Javelin has moved 2m downwards (and so -2m upwards).

As I said in the previous discussion, always taking upwards positive doesn't stop you needing to think about the direction that the object in question is moving.

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