A particle is placed at the point "A" of...

A particle is placed at the point "A" of a frictionless track "ABC" as shown in figure.It is gently pushed towards right.The speed of the particle when it reaches the point "B" is: (Take `g=10m"/"s^(2)`

`sqrt(10)m"/"s`

20 m/s

`2sqrt(10)m"/"s`

10 m/s

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