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=2Ï€r/v
T/2 = πr/v =t
a = v(−v)/t
a = 2v/t
a = 2v2/Ï€r
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Physics