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A small block of mass 1 kg is a circula...

A small block of mass `1` kg is a circular are of ratius `40` m . The block sides along the track without topping and a frictionnal force acts on it in the direction opposite in the instrmens velocity . The work done in evercoming the friction up to the point `Q` as shown is the figure below is `150 J`
(Take the acceleration due to gravity `g = 10 ms^(-2))`

The speed of the block when it reaches the point `Q` is

A

`5 ms^(-1)`

B

`10ms^(-1)`

C

`10sqrt3 ms^(-1)`

D

`20ms^(-1)`

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