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# M1 Parallel vector question watch

1. I'm looking at some past exam papers and on the June 02 M1 Edexcel one Q5 is "A particle P of mass 2kg moves in a plane under the action of a single constant force F newtons. At time t seconds the velocity of P is vms^-1. When t=0 v = (-5i + 7j) and when t = 3, v = (i -2j)." There are various parts and then question e is "Find the time at which P is moving parallel to the vector i+j". I really have no idea where to go with this and I'd greatly appreciate a pointer as to what this means. Bear in mind my vector education is somewhat rudimentary.

EDIT: Sorry I'm a complete moron who didn't think to search. Related threads came up with " if it is parallel to 1i+1j then the i+j components must be in the same ratio as they are with the vector 1i+1j. so your i value must equal your j value. So you make them equal and solve.". I'll have a try and come back if I have trouble.

EDIT2: I still have no clue, actually. Can somebody help?

EDIT3: Uh, nevermind. You just do what was said in what I quoted. Apologies for this silly thread.

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Updated: February 7, 2010
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