Question: A force of 25N pushes a curling rock from rest 1.0 m across a frictionless surface. Find the FINAL kinetic energy.
attempts:
Well i guess it would be changeinEk
so i tried Wnet=changeinEk
fnet x changeinD = 1/2mvf^2-1/2mvi^2
to fnet x changeinD +1/2mvi^2=1/2mvf^2
Then divided out mass from both sides because it isn't given then cut out vi because it's 0 and isolated vf to get √(2 x fnetxchangeinD=vf
i got vf= 7.07m/s but how am i supposed to find kinetic without mass? No clue about this question, Thanks.