1. The problem statement, all variables and given/known data A trolley of mass 0.5 kg rolls along a level, frictionless ramp at a velocity of 6.0 m s-1. It collides with a second trolley of mass 1.0 kg which is initially at rest. The first trolley rebounds with a speed of 2.0 m s-1 . a) Stating clearly any principles involved, find the velocity of the second trolley after the collision. b) Compare the kinetic energy before and after the collision. Is the collision elastic? 2. Relevant equations p = m x v E=1/2*m*v^2 3. The attempt at a solution Momentum before collusion for carriage A: 0.5 x 6 = 3 Momentum before collusion for carriage B: 1 x 0 = 0 Total Momentum before : 3 + 0 = 3. Total Mass = 1 + 0.5 = 1.5. p = m x v v = p / m 3 / 1.5 = 2. The principles involved are that as long as no external forces are acting on the object the total momentum stays the same in a collisions. Is this correct for the first one? part b: 0.5 x 1.5 x 62 = 27 0.5 x 1.5 x 22 = 3 The collision is inelastic as kinetic energy is lost?