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A level maths question help

Can someone explain how to do this question (photo attached, it’s N6), i think r should be a parallel to/a multiple of the vector (i - j) as this is the vector for the bearing 135, but I can’t seem to solve it.
The answer is ln2

(edited 4 years ago)

so you first need to find the velocity vector v.... you need to do something to the position vector r

Reply 3

emma64

Original post by the bear

so you first need to find the velocity vector v.... you need to do something to the position vector r

Differentiate it? Then do I put the i and j components equal to 1 and -1 respectively. Or do you have to put them equal to Lander 1 and -1? Sorry I’m really bad at mechanics

Reply 4

the bear

Original post by emma64

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Differentiate it? Then do I put the i and j components equal to 1 and -1 respectively. Or do you have to put them equal to Lander 1 and -1? Sorry I’m really bad at mechanics