A small block of mass \( m \) is \( \mathrm{P} \) pushed towards a ...

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A small block of mass \( m \) is
\( \mathrm{P} \) pushed towards a movable wedge of mass \( \eta m \) and height \( h \) with initial velocity \( u \). All surfaces are smooth. The minimum value of \( u \) for which the block will reach the Figure 4.110 top of the wedge :
(A) \( \sqrt{2 g h} \)
(B) \( \eta \sqrt{2 g h} \)
(C) \( \sqrt{2 g h\left(1+\frac{1}{\eta}\right)} \)
(D) \( \sqrt{2 g h\left(1-\frac{1}{n}\right)} \)
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