Please help with A and B

A pellet of mass mp = 2.18-g, moving horizontally with an initial speed Vp, embeds itself in a mg = 3.12- kg pendulum bob that is initially at rest. The length of the pendulum is 0.415 m. After the collision, the pendulum swings to one side and comes to rest when it has gained a vertical height of h = 10.4 cm. The mass of the string is negligible. Before After L h B m mB metme A. (10) What angle does the string make with the vertical when the pendulum swings to maximum vertical height of h = 8.4 cm? B. (10) Find the initial speed Vp of the pellet