An autonomous underwater vehicle is cruising in a straight path at a constant depth. The net force acting on the vehicle is zero, and the net moment acting on it is also zero. Which statement about the vehicle is correct?
It must be stationary.
It is in a state of equilibrium.
Its velocity is continually changing.
Its rotational speed is increasing.
43 exam-style questions on CIE IGCSE Physics 1.5.2a Moment of a force. Each one has a worked solution and a mark scheme showing where the marks go.