A body revolves with constant speed v in a circular path of radius r . the magnitude of its average acceleration during motion between two points in diametrically opposite direction is:

 The acceleration will change as there is change in the velocity at any direction.Speed of the body is given to be constant. At diametrically opposite points velocity will be in opposite direction.

As we know that

T=2πr/v

T/2 = πr/v =t

a = v(−v)/t

a = 2v/t

a = 2v2/πr