A small block of mass $m$ is released from rest from position $A$ inside a smooth hemispherical bowl of radius $R$ as shown in figure. Choose the wrong option(s)

 

Acceleration of block is not constant throught. 

Only force acting on the block at A is mg, so acceleration at A is $\frac{mg}{m}i.e. g.$

Acceleration of block at $B$ is $V^2/R$ where $V^2$ = $2gR$.