Which one of the following statements about the coriolis force is not correct?

Figure shows top view of a circular rotating table rotating with speed $\omega$. Two particles connected by a string are kept on two mutually perpendicular radii. Coefficient of friction is $\mu .$ What can be the maximum angular speed of the table so that particles do not slip on it?

A block $m$ is kept stationary on the surface of an accelerating cage as shown in figure. At the given instant, study the following statements regarding the block.

(i) Normal reaction performs positive work on the block.
(ii) Work done by the friction force on the block is negative.
(iii) No net work is done by normal reaction and frictional force on the block.