A 7kg bowling ball is raised 1.5m into the air. What is the bowling ball's gain in gravitational potential energy?

Question

A 7kg bowling ball is raised 1.5m into the air. What is the bowling ball's gain in gravitational potential energy? SHOW WORK PLEASE! THANKS!!!!!

Answer 1

potential gravitational energy (PE) is simply :

PE = m*g*h   where g = 9.81 m/s²  (earth's gravity at the earth surface)

(note: PE is always referenced from an arbitrary height)

 

so, PE =  mgh = 7*9.81*1.5 = 103.005 (kg*m²/s²) or Joules

 

(note: units multiplied are:  kg*(meters/s²)*meters, which also = 1 Joule)