Physics
posted by haylee .
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?

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)