A block of mass M is released from a height R on the frictionless inclined the incline leads to a circle of radius R/2 the maximum height attained by the block is

1 less than R/2

2 Greater than R

3 Equal to R

4 less than R but greater than R/2

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The velocity of the block at bottom is √2gR. Now for the block to complete the circle the velocity required is greater than or equal to √5gR/2 but the velocity is less than this there it cannot complete the circle. To oscillate in the lower half, it's velocity should be leads than or equal to √gR, but that is again not the case, therefore the block will go in the upper half and fall down like a projectile that is will not complete the circle. So in the conclusion we can say that the maximum height attained by the block is more than R/2 but less than R.