Asolid iron ball of mass 770 kg is used on a building site. the ball is suspended by a rope from a crane. the distance from the point of suspension to the centre of mass of the ball is 12 m.

From a balistics pendulum as an example, which is probably where you are at... Triangles, L = 12m, x_0 = 1.6, we need to find the angle (theta) sin (theta) = 1.6/12 = 0.1333 theta = ArcSin(0.1333...) = 0.1337 rad Then, this is the height that the mass vertically raises in it's arc y_2 = L-L*cos(theta) = 0.107 m use y_2 in a kinematic swing... v=sqrt(2gy_2)=1.45m/s