i have a Qns. given that i have a 2kg mass on earth and i want to accelerate from 0 m/s to 10 m/s the work done should be : Workdone = 1/2(m)(V)^2 - 1/2(m)(v)^2 = 1/2(2)(10)^2 -0 = 100 J however, if i were to take my frame of reference from let say space i have to include the speed of the earth orbiting the sun. then the equation turns out like this : let the speed of earth orbiting sun be= 100 m/s Workdone = 1/2(2)(110)^2 - 1/2(2)(100)^2 = 2100 J so the Qns is why is there such a difference just because i take a different frame of reference? shouldn't the workdone be the regardless of my frame of reference?? Thanks.