A ball of mass m is dropped onto a smoot...

A ball of mass m is dropped onto a smooth fixed wedge of inclination `theta` The collision is perfectly elastic . If after the collision, the x component of the velocity of the block is component of the velocity of the block is `sqrt(2 gh) ` , then `theta` is

`30^@`

`45^@`

`60^@`

`15^@`

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