Posted by **haylee** on Thursday, September 22, 2011 at 8:11pm.

If vector a has a magnitude of 29 units and points in the positive y direction. when vector b is added to a the resultant is 24 units in the negitive y direction, what is the magnitude of b?

- Physics -
**Steve**, Friday, September 23, 2011 at 1:18pm
Do simple vector addition:

a = (0,29)

b = (x,y)

a+b = (0,-24)

0+x = 0 ==> x = 0

29 + y = -24 ==> y = -53

So, b = (0,-53)

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