A  small block of mass `M` move on a frictionless surface of an inclimed from as down is
Channel: Doubtnut
Date: 2020-07-12

A  small block of mass `M` move on a frictionless surface of an inclimed from as down is figure . The engle of the inclime suddenly change from `60^(@)` to `30^(@)`  at point `B` . The block is initally at rest at `A` Assume the collsion between the block and the incline are totally inclassic `(g = 10m//s^(2)`) If collision between the block and the incline  is completely elestic , then the vartical (apward) component  of the of the block at point `B` immediatly after it stricess the scond indine is -