An underwater survey vehicle moves along a straight north–south route. North is chosen as the positive direction.
For one interval of its journey, the vehicle's velocity–time graph is a horizontal line below the time axis at -3.5 m/s.
Which statement describes the motion of the vehicle during this interval?
It travels south at a constant velocity with zero acceleration.
It travels south and its speed increases at a steady rate.
It travels north and its speed decreases at a steady rate.
It travels north at a constant velocity with zero acceleration.
96 exam-style questions on Edexcel GCSE Physics 2.2 Speed, velocity and acceleration, covering 2.2.1 Speed and distance–time graphs, 2.2.2 Acceleration and the uniform-acceleration equation, 2.2.3 Velocity–time graphs, and 2.2.4 Measuring speed, typical speeds and free-fall acceleration. Each one has a worked solution and a mark scheme showing where the marks go.