1. The problem statement, all variables and given/known data A 50 g ball of clay traveling at speed [tex]v_0[/tex] hits and sticks to a 1.0 kg block sitting at rest on a frictionless surface. a. What is the speed of the block after the collision? b. Show that the mechanical energy is not conserved in this collision. What percentage of the ball's initial energy is "lost?" 3. The attempt at a solution For part (a), I just said m_1*v_0 = (m_1 + m_2)*v_1 0.05*v_0 = (0.05+1)*v_1 v_0 = 21*v_1 I'm hoping this is correct! Now, part (b) I'm not entirely sure of. I guess there is no PE in this case so I should show that (.5)(m_1)(v_0)^2 [tex]\neq[/tex] (.5)(m_1)(v_0)^2 + (.5)(m_1)(v_1)^2 Is this it? How do I go on about finding the percentage "lost"?