1. The problem statement, all variables and given/known data A 16g bullet is fired into the bob of a ballistic pendulum of mass 1.5kg When the bob is at its maximum height, the strings make an angle of 60 degree with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet. 2. Relevant equations pi=pf 3. The attempt at a solution So I think it is an inelastic collision so vf = (mbullet*vbullet) / (mbullet+mblock) After collision: (1/2)*(mbullet+mblock)vf2 = (mbullet+mblock)*g*h h=2.3-2.3*cos60=1.15m then I solved for vf2=2*9.981*1.15=22.563 the I substitute in to the first formula ( I actually squared both sides to use vf^2) to find vbullet= 346.2 m/s. However it is wrong. Where did I do wrong ??