In Fig., particle 1 of mass `m_1` = 0.30 kg slides rightward along an x axis on a frictionless floor with a speed of 2.0 m/s. When it a one-dimensional elastic collision with stationary particle 2 of mass `m_2` = 0.40 kg. When particle 2 then reaches a wall at `x_w` = 70 cm, it bounces from the wall with no loss of speed. At what position on the x axis does particle 2 then collide with particle 1 ?

Answer

x=-28 cm