Answer:
sin(t)j - cos(t)i
Step-by-step explanation:
Let's start with A:
Position vector = cos(t)i
Velocity vector = -sin(t)i (differentiating the position vector)
acceleration vector = -cos(t)i (differentiating the velocity vector)
Then we go to B:
Position vector = sin(t)j
Velocity vector = cos(t)j
acceleration vector = -sin(t)j
Relative acceleration = -cos(t)i - (-sin(t)j) = sin(t)j - cos(t)i