Energy Conversion in Lifting Mass Vertically using a DC Electric Motor   by Observing Required Time to Lift Object for a Certain Height
  In lifting mass vertically using a DC electric motor energy conversion from electric energy, through intermediate kinetic energy, to gravitation potential energy shows that time required {\Delta}t to lift load mass m for height h is dependent quadratically to m. Several approaches to explain the experiment observation are discussed in this work, from ideal energy conversion to numerical solution from differential equation. 
Sparisoma Viridi, Acep Purqon, Sidik Permana, Wahyu Srigutomo, Anggie   Susilawati, Bebeh Wahid Nuryadin, Nurhasan
physics.ed-ph physics.class-ph