1. The problem statement, all variables and given/known data An object, consisting of two point masses with mass m are connected by a rigid shaft with negligible mass. They are lying horizontally at rest. One of the point masses is instantly given a speed of v. Calculate the total energy of the system once the system has stopped rising in the gravitational field. 2. Relevant equations 3. The attempt at a solution Not really sure if it can be solved by simple methods. I assume I need to calculate the rotational energy of the system and also the kinetic energy of any velocity perpendicular to g-acceleration, since once it stops rising, velocity parallel to the gravitational acceleration will be gone. One mass starts moving up, the others inertia makes it move in a curved path, causing centripetal acceleration, perhaps sideways motion of the center of mass etc? Any tips to get me on the right path and if it can be solved without calculus are welcomed.