(Solved): Consider a frictionless track as shown in the figure below. A block of mass m1=4.20kg is relea ...

Consider a frictionless track as shown in the figure below. A block of mass $m_1=4.20\mathrm{kg}$ is released from (A). It makes a head-on elastic collision at (B) with a block of mass $m_2=15.5\mathrm{kg}$ that is initially at rest. Calculate the maximum height to which $m_1$ rises after the collision.