Meriam, Kraige & Bolton — Kinetics of Particles: Problem 3_192

3/192 A particle is launched with a horizontal velocity \( v_0 = 0.55 \text{ m/s} \) from the \( 30^\circ \) position shown and then slides without friction along the funnel-like surface. Determine the angle \( \theta \) which its velocity vector makes with the horizontal as the particle passes level \( O-O \). The value of \( r \) is \( 0.9 \text{ m} \).