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)`) The speed of the block at point `C` immediately before is leaves the second incline isA. `sqrt120 m//s`B. `sqrt105 m//s`C. `sqrt30 m//s`D. `sqrt75 m//s`

A small block of mass `M` move on a frictionless surface of an inclime

1.	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)`) The speed of the block at point `C` immediately before is leaves the second incline isA. `sqrt120 m//s`B. `sqrt105 m//s`C. `sqrt30 m//s`D. `sqrt75 m//s`
Answer» Correct Answer - B `v_(c )^(2) = v_(B)^(2) + 2g(h_(2) -h _(1)` `rArr = v_(c ) = sqrt(45^(2) + 2 xx 10 xx 3) = sqrt(105) ms^(-1)`

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