1. The problem statement, all variables and given/known data In July 2005, NASA's "Deep Impact" mission crashed a 372-kg probe directly onto the surface of the comet Tempel 1, hitting the surface at 37000 km/h. The original speed of the comet at that time was about 40000 km/h, and its mass was estimated to be in the range (0.10-2.5) x 10^14 kg. Use the smallest value of the estimated mass. What change in the comet's velocity did this collision produce? 2. Relevant equations ΔP 3. The attempt at a solution I tried using P_initial = P_final and come out with the change in velocity of 0, or 80000 km/h, and they are both incorrect. Could someone help me as to where I am going wrong? I did: (m_p)(v_p) + (m_c)(v_c) = V(m_p + m_c) and solved for V.