1. The problem statement, all variables and given/known data There are two questions. 1) A baseball, m=0.045 kg, moves in +y-direction with v = 5 m/s. a tennisball is moving in the -x direction with speed of 2m/s. Wat is the magnitude and direction of total momentum in the system? 2) A 0.01 kg rifle bullet is fired with v = 500 m/s into a ballistic pendulum of mass 5 kg suspended from a cord 0.6 m long. Find the height of the pendulum, the initial kinetic energy of the bullet and the kinetic energy of the bullet and pendulum. 3. The attempt at a solution 1) I have no idea, beside finding the momentum of the each balls. 2) I tried using p_bullet + p_pendulum = (m_bullet + m_pendulum)u, but I get u = 0,998 m/s, which i believe is incorrect.