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# m1 momentum

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1. how am i supposed to know to what direction the final speed of A is!!! like it didnt specify in the question and idk whether i should put it as - or + and its changing the whole answer. was there some sort of guide on the q??
2. sorry forgot to attach it in the ques
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3. (Original post by pondsteps)
sorry forgot to attach it in the ques
(Original post by pondsteps)
how am i supposed to know to what direction the final speed of A is!!! like it didnt specify in the question and idk whether i should put it as - or + and its changing the whole answer. was there some sort of guide on the q??
As B is brought to a rest and that A cannot travel through B, A will reverse direction so it will be negative (assuming your v is positive)
4. (Original post by pondsteps)
how am i supposed to know to what direction the final speed of A is!!! like it didnt specify in the question and idk whether i should put it as - or + and its changing the whole answer. was there some sort of guide on the q??
you guess

if your answer's positive you got the direction the right way round
5. (Original post by Cryptokyo)
As B is brought to a rest and that A cannot travel through B, A will reverse direction so it will be negative (assuming your v is positive)
thanks alot x

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