Walker, Halliday & Resnick — Center of Mass and Linear Momentum: Problem 55

55 Block 1 of mass 3.0 kg is sliding across a floor with speed \(v_1 = 2.0 \text{ m/s}\) when it makes a head-on, one-dimensional, elastic collision with initially stationary block 2 of mass 2.0 kg. The coefficient of kinetic friction between the blocks and the floor is \(\mu_k = 0.30\). Find the speeds of (a) block 1 and (b) block 2 just after the collision. Also find (c) their final separation after friction has stopped them and (d) the energy lost to thermal energy because of the friction.