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

5 m s^{- 1}

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10 m s^{- 1}

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10 \sqrt{3} m s^{- 1}

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20 m s^{- 1}

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Solution

The correct option is B $10 m s^{- 1}$
Using work energy theorem
$m g R s i n 30^{o} + W_{f} = \frac{1}{2} m v^{2}$
$200 - 150 = \frac{v^{2}}{2}$
$v = 10 m / s$

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