A particle of mass m is initially at rest relative to a train moving at constant velocity. A constant force F₀ acts along the train's motion for time t₀. A girl in the train and a boy on the ground measure the work done by F₀. Which statements are incorrect?
Select all that apply

Question

A particle of mass m is initially at rest relative to a train moving at constant velocity. A constant force F₀ acts along the train's motion for time t₀. A girl in the train and a boy on the ground measure the work done by F₀. Which statements are incorrect?

Select all that apply

G1 Physics · Accepted Answer

Work is frame-dependent. The ground observer includes the train's additional displacement and therefore measures more work than the girl, so A is incorrect and B is correct. C is also incorrect. Since the train speed is not numerically given, D is true. Thus the incorrect statements are A,C.