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A particle of mass \( m \) comes down on
a smooth inclined plane from point
\( B \) at a height of \( h \) from rest. The
magnitude of change in momentum of
the particle between position \( A \) (just
before arriving on horizontal surface)
and \( C \) (assuming the angle of inclintrim \( A \)
with respect to the horizontal) is
\( \begin{array}{ll}\text { (1) } 0 & \text { (2) } 2 m \sqrt{(2 g h)} \sin \theta \\ \text { (3) } 2 m \sqrt{(2 g h)} \sin \left(\frac{\theta}{2}\right) & \text { (4) } 2 m \sqrt{(2 g h)}\end{array} \)
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