There are several things wrong with the question:
-- " 5 m/s " is not a turning speed.
-- 'Constant speed' can mean zero acceleration, or it can mean
huge acceleration if it's constant speed around a circle. There's
not enough information here to tell the difference.
-- The answer to an "is it ?" question is 'yes' or 'no', not 'true' or 'false'.
All in all, this question is so ragged that any reliable answer
should probably be as negative as possible.