Although I guess it's possible that pressure to get it published meant there was insufficient scrutiny.
The authors of the new paper confused "velocity" for "acceleration" in one mechanics equation used to calculate kinetic energy.
The second error was in an equation used to measure movement, where what should have been "distance" was replaced by "time". Other terms used in the first appendix, while not incorrect, were also considered problematic by some physicists and teachers.
It's as if I gave you an equation to calculate your height, and it gave you an answer in kilograms Alby Reid
That the howlers have come from a department whose head is Education Secretary Michael Gove, who has insisted on higher teaching standards and rigorous testing, will strike many as ironic.
No doubt teachers will be blamed somewhere along the line for this.