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By what acceleration the boy must go up ...

By what acceleration the boy must go up so that `100kg` block remains stationary on the wedge. The wedge is fixed and is smooth `(g =10m//s^(2))`
.

A

`2 ms^(-2)`

B

`4 ms^(-2)`

C

`8 ms^(-2)`

D

`6 ms^(-2)`

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The correct Answer is:
D
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