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From the F.B.D. of rod and wedge separately,
we see,
acceleration of rod is along the rod and is equal to a
A
and that of wedge is in forward direction that is a
B
.
Thus , on resolving a
A
along the direction of a
B
, we get the given relation:
a
A
cos(θ)=a
B
thus the relation between magnitudes of aA and aB is
∣a
A
∣cos(θ)=∣a
B
∣
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