Look at the speed time graph on the right. Speed is in metres/second while time is in seconds Which comment is true?
A) The acceleration of the object represented by the graph is decreasing. B) The acceleration of the object represented by the graph is increasing. C) The object travels with constant acceleration. D) The object has zero acceleration. E) None of the statements above are correct.

The Solution...

The gradient of he speed-time graph represents the acceleration. Obviously the gradient is slowly decreasing as the journey goes on. The acceleration, therefore, is slowly decreasing. Click the solution link for further reading.
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(c) Dynamic Science.