QUESTION: a 2.50g bullet traveling at a speed of 425m/s, strikes the wooden block of a ballistic pendulum.the block has a mass of 215g.
a.)find the speed of the bullet/block combination immediately after the collision.
b.)how high does the combination rise after the collision?

For a) use the principle of conservation of momentum,

m_1u_1 + m_2u_2=m_1v_1+m_2v_2