The accelerations of a particle as observed from two different frames S1 and S2 have equal magnitudes of 2 ms-2.

Acceleration of particle w.r.t. frame S1:a→p−a→s1=2n^Acceleration of particle w.r.t. frame S2:a→p−a→s2=2m^where m^ and n^ are unit vectors in any directions. Now relative acceleration of frames :a→s2−a→s1=2(n^−m^)Its magnitude can have any value between 0 to 4 ms-2, depending upon the directions of m^ and n^.