1. The problem statement, all variables and given/known data How was energy lost while using the ballistic pendulum? 2. Relevant equations Initial KE= 1/2mb*Vb^2 = 0.929J Final Potential graviational = (m+M)gh= 0.198J Energy loss = 0.929J - 0.198J= 0.731J 3. The attempt at a solution I think the answer is: energy lost dues to friction (air resistance) and waste heat while using the ballistic pendulum. is this correct? Please help? Thanks a lot in advance.