Oh please. A calculator doing basic physics calculations for an object is nowhere near the complexity of a real time physics engine. Physics engines in games often operate at fixed rates, say 60hz or 100hz where they must detect collisions for large numbers of dynamic objects, and iteratively resolve penetrations between large numbers of independently moving objects, on top of the more advanced functionality of maintaining constraints of joints or other physical modelling of motors, pulleys, etc. The amount of work involved in that is far above punching in some velocity math on a calculator.